Best Mjr Tumblers Kids Rock Tumblers in 2026

HIGH QUALITY - This rock polisher grit refill pack comes with enough high-quality silicon carbide grit to put a dazzling polish on up to 20 lbs. of rocks, gems, glass, and more

EASY TO USE FOUR-STAGE ROCK GRIT - The first rock tumbling grit stage provides initial shaping, the second smooths rock surfaces, the third pre-polishes rocks, and the fourth provides the final polish

COMPATIBLE WITH ALL TUMBLERS - This complete 4-step rock tumbler grit refill kit works with all rock tumblers. For best results, use with National Geographic Rock Tumblers and rock tumbling supplies

COMPLETE KIT - 4 Step grit pack and plastic filler for use in 15 lb. tumbler or five 3 lb. tumbles.

CONTAINS - 1 lb. 60/90 Coarse Silicon Carbide Grit, 1 lb. 180/220 Medium Silicon Carbide, Grit, ½ lb. 500 Fine Silicon Carbide, ½ lb. 1200 Aluminum Oxide Polish and 1 lb. of premium high-impact polypropylene plastic filler pellets. Protect and cushion fragile stones and reduce tumbling noise.

GRIT SOLD BY WEIGHT NEEDED FOR EACH STEP – Steps 1 & 2 are 1 lb. each and Steps 3 & 4 are ½ lb. each but all are sold in the same size jars for packaging consistency. The different weights, along with different densities, will mean that jars will not have equal amounts of fullness.

Complete rock tumbling medium kit: 3.5 lbs. 4-step grit set and poly plastic pellets, to polish any rock. Packaged in easy-to-use-and-store bottles

Includes: Step #1 Coarse Grit (1 lb.), Step #2 Medium Grit (1 lb.), Step #3 Pre-polish Grit (1/2 lb.), Step #4 Grit (1/2 lb), Polypropylene Plastic Poly Filler Pellets (1/2 lb.), Instruction Guide

Compatible with all rock tumblers: Can be used in tumblers from any brand: Dan&Darci, Elenco, Lortone, National Geographic, Smithsonian, Thumler and more

[5 STEPS] Just measure in the grit, add enough water to cover the stones, seal the barrel, and tumble. The only variable is how much of the product to use in your rock tumbler. We suggest 2 tbsp of grit per pound of stones, which is a good rule of thumb.

[COMPLETE KIT] 5 Step grit pack and ceramic filler for use in 15 lb. tumbler or five 3 lb. tumbles. Coarse Grit, Medium Grit, Pre-polish Grit, Grit, Polypropylene Plastic Poly Filler Pellets and Instruction Guide.

[EASY TO USE] Includes a clear instruction guide on how to use the grits and plastic pellets.Large Amount of Grit, This is a large amount of each size grit for the price.

Belts are consumables, so we'd like to offer extra 5 belts for spare use. 𝐏𝐥𝐞𝐚𝐬𝐞 𝐚𝐝𝐝 𝐭𝐡𝐢𝐬 𝐥𝐢𝐬𝐭𝐢𝐧𝐠 𝐭𝐨 𝐲𝐨𝐮𝐫 𝐰𝐢𝐬𝐡 𝐥𝐢𝐬𝐭 𝐚𝐧𝐝 𝐭𝐡𝐞𝐧 𝐫𝐞𝐚𝐜𝐡 𝐨𝐮𝐭 𝐚𝐭: 𝐬𝐮𝐩𝐩𝐨𝐫𝐭@𝐢𝐤𝐨𝐨𝐥𝐬𝐭𝐨𝐧𝐞.𝐜𝐨𝐦 𝐭𝐨 𝐠𝐞𝐭 𝐭𝐡𝐞 𝐟𝐫𝐞𝐞 𝐛𝐞𝐥𝐭𝐬 (𝐰𝐨𝐫𝐭𝐡 𝟏𝟐𝐔𝐒𝐃).

2 Years Warranty - Special Bonus Just for You! The warranty covers accessories replacement, techical support, 𝟐𝟒/𝟕 𝐜𝐥𝐚𝐢𝐦 𝐡𝐨𝐭𝐥𝐢𝐧𝐞 and so on. 𝐌𝐚𝐤𝐞 𝐲𝐨𝐮𝐫 𝐦𝐨𝐧𝐞𝐲 𝐰𝐨𝐫𝐭𝐡 𝐞𝐯𝐞𝐫𝐲 𝐩𝐞𝐧𝐧𝐲.

START A TUMBLING JOURNEY -- Koolstone Rock Tumbler turn rough rocks into polished gems, then you will be very excited to see the stones change with each cycle. That's a fun process of rock tumbling and a family little project for parent-child endeavor.

Premium Rock Tumbling Media

Protects & Cushions Stones

Improves Tumbling Action

★【4 Steps】Be Patient. There are 4 total cycles, 7 days each to have pretty rocks / gems. Step 1, 60 Coarse Silicon Carbide Grit. Step 2, 220 Medium Silicon Carbide Grit. Step 3, 500 Fine Silicone Carbide Grit. Step 4, 1200 Aluminum Oxide Grit. Just measure in the grit, add enough water to cover the stones, seal the barrel, and tumble. The only variable is how much of the product to use in your rock tumbler. We suggest 2 tbsp of grit per pound of stones, which is a good rule of thumb.

★【Large Amount of Grit】This is a large amount of each size grit for the price. This kit comes with enough grit to complete approximately 16-20 lbs of rocks. This kit contains 2 lbs 60 Coarse Silicon Carbide Grit, 2 lbs 220 Medium Silicon Carbide Grit, 1 lb. 500 Fine Silicone Carbide Grit, 1 lb. 1200 Aluminum Oxide Final Polish Grit. COMPATIBLE WITH ALL BRAND TUMBLERS.

★【Jars, Labels & a Scoop】Nice hard plastic jars with lids (as opposed to plastic bags). Bottle caps are very secure. Definitely they will not leak. Use the amount you need and set it back on the shelf for the next round. A scoop is included for the correct dose. No need to pour the material out, which possibly make a mess while doing so. They are neatly packaged and easy to read labels. Tip: you could put your tumbler on a foam pad to eliminate noise.

POLISHING BARREL – This rock tumbler barrel allows you to polish like a pro. We recommend having a dedicated barrel that is only used for the final step in the polishing process to avoid leaving any remnants of rougher grits that might scratch your gemstones and diminish the final polish.

REPLACEMENT PART – Barrel is compatible with the National Geographic Professional Rock Tumbler and Hobby Series Tumbler as well as the Discover with Dr. Cool Professional Rock Tumbler and Hobby Series Tumbler

QUIET AND CONVENIENT – Constructed of durable rubber and with a leak-proof lid, this barrel is designed to be low-noise and easy to use

💎【Complete Professional Rock Tumbler Grit Kit】WKTURN rock polishing grit set comes with a 5-step grit kit and filler, from coarse grit, medium grit, pre-polish grit, to final polish grit, to ultimate polish colour lifting media. Polishing your rock, glass and gems with ease.

💎【Easy to use】Stage 1 coarse grit to initially shape the raw stone; stage 2 medium grit to smooth the surface of the stone; stage 3 pre-polished stone; stage 4 final polish to get your own stone. The fifth stage, the ultimate colour lift, gives your stone a brilliant finish.

💎【Easy To Storage】Each step of the rock polishing supplie is packaged in a reusable bottle container, making it easier to store than bag packaging and preventing mess. Comes with a small spoon for easy use.

Power Adapter: 120V/60Hz Barrel Capacity: 3LB

Packaging List: Includes tumbler, 0.5lbs of walnut shell media, five v-belt, and instructions

Professional Features: The durable motor allows you to tumble multiple batches of rocks. An improved, leak-proof barrel is lined with rubber for quieter operation

COMPLETE ROCK TUMBLING KIT - Everything you need to create polished gemstones: tumbler, low-noise barrel, half pound of gemstones (9 different types), four polishing grits, sifter, jewelry fastenings, detailed full-color learning guide.

TURN ROUGH ROCKS INTO POLISHED GEMS - Make any stone sparkle and polish everyday rocks into dazzling gemstones! Simple operation and durable design.

DURABLE QUALITY - This high-quality tumbler has a powerful motor that will last for years. Noise reducing leak-proof rubber barrel with stainless steel lid.

CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This starter rock tumbler makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and durable design.

A TUMBLER THAT'S MADE TO LAST - The durable motor allows you to tumble multiple batches of rocks. An improved, leak-proof barrel is lined with rubber for quieter operation while tumbling on the sturdy tumbler base.

ALL-IN-ONE TUMBLING KIT - This kit has everything you need and then some! You get ½ a pound of rough rocks with nine different types of gemstones inside, five jewelry fastenings, and our four-stage rock polishing grit.

DIVE INTO THE FUN ROCK TUMBLER KIT – Rock polisher kit is an fun and educational toy, that is suitable for kids and adults.Thanks to its simple operation and durable design, you can easily turn everyday rocks into dazzling polished gemstones and crystals.Let's create your own gems now!

COMPLETE ROCK TUMBLING KIT – Everything you need to create polished gemstones: tumbler, low-noise barrel,4 polishing refill grits, 1 Rock Tumbling Filler media, sifter, 10 types of real rough gemstones,jewelry fastenings,extra tumbler belt and a detailed full-color learning guide.

EASY TO USE – Simple instructions Digital LCD screens with a 9-Day Polishing shutoff feature & 3 Speed Settings for each tumbling cycle, make rock tumbling fun and easy. Control the number of days for each tumbling cycle with the one-touch timer and automatic shutoff feature, set it and forget it! This is a great gift for kids.

heavy-duty, professional-quality tumbler

15lb. capacity

Continuous-duty motor is fan-cooled, with overload protection

Includes Amethyst, Jasper, Agates and others

8 Oz. Of Precious Stones

0.63 Oz. Of Coarse Grit

📣NOTE: Please kindly contact us for free replacement if the barrel and belt get broken or if any parts missing from this kit, and the new one will be shipped out in 24 hours. For any issues, we ask you to be patient, we promise to solve all problems. Your 100% satisfaction is our goal.

🍀EASY TO CREATE YOUR GEMSTONES - Rock tumbler kits are a fantastic and exciting activity for children of all ages.Easy operation and durable design. Learn the fun process of rock tumbling with this beginners/professional rock stone tumbler. It will turn rough rocks into beautifully polished gemstones. It is a hugely popular hobby for kids and adults!

🍀DURABLE QUALITY - This simple tumbler is a great way for children to discover a new hobby. It includes a 1 pound of rocks, grit, polisher, some accessories like a necklace and earrings to show off the finished products, and a learning-and-instruction guide. Metal case and high-powered motor give you a workhorse machine that will last for years.

We'll help with any issues. 𝐑𝐞𝐚𝐜𝐡 𝐨𝐮𝐭 𝐭𝐨 𝐮𝐬 𝐝𝐢𝐫𝐞𝐜𝐭𝐥𝐲 𝐟𝐨𝐫 𝐫𝐞𝐩𝐥𝐚𝐜𝐞𝐦𝐞𝐧𝐭 𝐨𝐫 𝐫𝐞𝐟𝐮𝐧𝐝, 𝐚𝐧𝐲 𝐢𝐬𝐬𝐮𝐞𝐬 𝐰𝐢𝐥𝐥 𝐛𝐞 𝐬𝐨𝐥𝐯𝐞𝐝 𝐭𝐢𝐦𝐞𝐥𝐲 𝐰𝐢𝐭𝐡 𝐚 𝐩𝐞𝐫𝐟𝐞𝐜𝐭 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧!

These grits are for 4 rounds of tumbling rocks: Cycle 1, Cycle 2, Cycle 3, Cycle 4.

Tumbling with different grits for each round help get mroe beautiful and shinning gemstones.

WHAT YOU GET - Our rock tumbler set includes a rock tumbler, 4 pcs polishing grits, various rough rocks, jewelry fastenings, a tube of glue and a detailed instruction manual.In addition, 2 drive belts are included in the set for replacement.

EASY TO USE - The instruction booklet in the learning toy set provides detailed instructions on the operation process of rough stone grinding. Any questions you don't understand can also be answered in the study guide booklet, which fully documents how to turn a rough stone into a beautifully polished gem.

EDUCATION TOYS AND STEM TOYS - Rock tumbler science toy is the perfect birthday and Christmas gift for boys and girls. It is a great stem toys for kids, Rock polisher can improve kid's interest in geography and science, as well as exercise kid's patience.

2 pounds of 120/220 Graded Silicon Carbide Grit (Step 2)

Compatible with ANY BRAND OF TUMBLER

Comes with FREE Polishing Instructions

Professional Grade Double Barrel Rotary Rock Tumbler

(2) 3 Pound Capacity Leak Proof Hard Rubber Barrel to Minimize Noise

Reliable, Heavy Duty Motor Designed to Operate 24/7 for Years

Made in the usa - pre measured for precise use in all 3 lb capacity rock tumblers

A great choice for all smaller or beginner "kidz" rock tumblers 1/2 lb capacity & larger (the smaller the tumbler the more charges you get!)

Your Rocks & Gems will Achieve a "glass-like" shine Polish- just like the pros!

One model A-r2 #115 rock tumbler

Two rubber tumbling barrels that holds 6 lbs of rocks

Each barrel interior measures 4 1/4" diameter x 4" deep (107 x 101 mm)

💎【Greate Your Own Unique Gemstones】Our Rock Tumbler is an extremely popular hobby for children and adults alike.This complete rock tumblering,revamped and upgraded,makes it even easier to turn rough rocks into beautiful gems.The professionally designed rock polish learns during the polishing process,making the polishing process more fun.

💎【Electrode Upgraded,Durable Rocks For Tumbling】The super durable motor gives our rock tumblers top quality without any noise disturbance.Interface has time and speed control settings,fully guaranteed.Upgraded design with high efficiency mode,back and forth rotating rolling to make your stones more glorious.

💎【All-in-one,Complete Rock Tumbler Kit】The rock tumbler kit contains everything you need,plus a few thoughtful giveaways.A professional rock polisher,a leak-proof,low-noise bucket,several different types of rocks,jewelry clasps,rock tumbler media,a strainer,and a warm instruction guide booklet that is very beginner-friendly.

❤ ❤ ❤ MOTOR are consumable, you can contact us for MOTOR FOR FREE if broken in 90 days.

✉ ✉ ✉ 90-Day Refund GUarantee & 2-Year VVarranty. yingan0915@163.com

❤ ❤ 【Upgrade Large 2.5 LB Leak-proof Rubber Barrel】: Large capacity Which allows to rock tumbler more rocks each time,To prevent the liquid from leaking during polishing, our rock tumbler is designed with double stainless steel top cover. It is so compact that you will need a screwdriver (which comes in the box) to open it easily. And the thickened barrel will make the machine last longer.

REFILL KIT WORK WITH ANY ROCK TUMBLER - These rough tumbling rocks are natural, unpolished, and irregular; Suitable for any tumbler to polish.

ROCKS FOR TUMBLING - Each gemstone is range from 1" to 2". 9 varieties of gemstones - Agate, Sodalite, Amethyst, Green Aventurine, Dalmatian Jasper, Red Jasper, Rose Quartz, Tiger's Eye, these stones are good rocks for tumbling due to their density and harness.

ROCK TUMBLER SUPPLIES - 0.72 lbs (about 16 pcs) rocks, coarse grit, fine grit, polishing sponge blocks.

Large 17lb Capacity Stainless Steel hexagon drum with removable rubber liner

Heavy Duty Powder Coating

Fan cooled motor made ideally for Rock Tumbling

Package include Step 1 Coarse Grit; Step 2 Medium Grit; Step 3 Pre-Polish;Step 4 Final Polish,A small spoon in step 3 bottle, 1 Bottle Plastic Pellets,1 Bottle Ceramic Filler Media, Total 4.5 Pounds.

Tips: The different weights and densities, will mean that jars will not have equal amounts of fullness.

Material: Step 1 Grit，Step 2 Grit，Step 3 Grit are Silicon Carbide，Step 4 is Aluminum Oxide,Plastic Pellets are resistant polypropylene,Ceramic Filler Media is High alumina porcelain.

Looking for an educational all ages gift that makes lsemi-precious gemstones.earning fun? Check out our kid- friendly Rock Tumbler! With this rock tumbler, kids can easily turn rough rocks into semi-precious gemstones

Looking for an educational all ages gift that makes lsemi-precious gemstones.earning fun? Check out our kid- friendly Rock Tumbler! With this rock tumbler, kids can easily turn rough rocks into semi-precious gemstones

This children’s rock tumbler is very user-friendly, with clear precision settings, a strong motor, and a no-mess design that parents love. Within minutes of receiving their tumbler, kids can begin creating beautiful gemstones. They’ll be amazed by the process and eager to learn more. That’s where our learning guide comes in.

10LB KIT CONTAINS: Step 1 Coarse Grit(2 LB); Step 2 Medium Grit(2 LB); Step 3 Pre-Polish(1.5 LB);Step 4 Final Polish(1.5 LB),Ceramic Filler(2 LB);Strong Polishing Beads(1 LB).

Compatible with ANY BRAND OF Rock Tumbler

Easy to Follow Step by Step Instructions

**4-Step grit pack with 6 pounds of total weight +1 Pounds Plastic Pellets Rock Tumbling Media Plastic Filler. Our universal grit is designed for any rock tumbler.

Step 1 - 2 lb. 60 Coarse Silicon Carbide Grit, Step 2 - 2 lb. 180/220 Medium Silicon Carbide Grit, Step 3 - 1 lb. 500 Fine Silicone Carbide, Step 4 - 1 lb. 1200 Aluminum Oxide Polish

**Packaged in 5 bottle to safely store unused product for later.