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

CREATE YOUR OWN GEMSTONES - Make any stone sparkle and polish everyday rocks into dazzling gemstones! This rock tumbler kit 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 – Our high-quality tumblers are made with a durable motor that’s designed to last for years. The leakproof rubber barrel reduces sound, making it 75% quieter than other plastic models. An excellent STEM activity for kids.

A COMPLETE HOBBY TUMBLING KIT - Everything you need to create polished gemstones: the tumbler, four polishing grits, sifter, nine types of real rough gemstones, plus a detailed full-color learning guide. Makes a great gift for girls and boys!

GEMSTONES OF NINE VARIETIES: Tiger’s Eye, Amethyst, Aventurine, Rose Quartz, Red Jasper, Agate, Sodalite, Dalmatian Jasper, Black Jasper. (3lb in total)

FOUR GRADES OF GRIT: Coarse, Medium, Fine, Polish. Transform your stones from rough rocks to dazzling gemstones!

JEWELRY FASTENINGS: 1 Necklace, 1 set of Earrings, 1 Keychain, 1 Ring. Create custom jewelry from your newly polished gemstones!

ENORMOUS VARIETY - This rock tumbler refill kit has 5 pounds of unpolished rocks and gemstones consisting of a 1-pound gemstone mix, 1-pound agate mix, 1-pound Madagascar mix, 1-pound jasper mix, and 1-pound petrified wood mix

ROCK POLISHING GRIT – There are 20 total rock tumbler grit packets in the kit, enough for five complete tumbling cycles with any rock tumbler

JEWELRY SETTINGS – Once your rocks are polished, use the 5 included jewelry settings to create beautiful keepsakes or use the included storage pouch to keep your favorite specimens all in one place

REAL GEMSTONES FROM MADAGASCAR - 3 pounds of raw rocks includes rose quartz, labradorite, red jasper, yellow jasper, indigo gabbro, and polychrome jasper, quantities of each gemstone may vary

FOUR GRADES OF GRIT - Coarse, Medium, Fine, Polish. Transform your raw stones from rough rocks to dazzling gemstones, this refill kit also works with all rock tumblers

JEWELRY FASTENINGS - Additional rock tumbler accessories include 1 Necklace, 1 set of Earrings, 1 Keychain, 1 Ring to create custom jewelry from your newly polished gemstones

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

IMPROVE YOUR ROCK TUMBLING RESULTS – Ceramic tumbler media makes the entire rock tumbling process more effective, improving delivery of rock tumbling grit, quieting tumbler noise, reducing rock breakage, and acting as a filler for smaller batches.

A LITTLE GOES A LONG WAY – Rock tumbling ceramic pellets are reusable and can be used during every rock polishing grit cycle. Ceramic polishing media is more effective than plastic tumbling media and will never stale or spoil.

COMPATIBLE WITH ANY TUMBLER – These rock tumbler ceramic pellets are safe to use with any rock tumbler. This versatile rock polish accessory is a fantastic addition to your stock of tumbling supplies.

CREATE YOUR OWN GEMSTONES - Rock tumbling is a hugely popular hobby for kids and adults! This robust rock polisher 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 has time and speed control settings so you can set it, and forget it. An improved, leak-proof barrel features a stainless-steel lid.

ALL-IN-ONE TUMBLING KIT - You get 1/2 pound of rough rocks with 9 different types of gemstones inside, 5 jewelry fastenings, tumbler grit, a strainer, and our innovative new GemFoam polishing foam.

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.

CREATE YOUR OWN GEMSTONES - Make any stone sparkle and polish everyday rocks into dazzling gemstones! This rock polisher kit 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 – Our high-quality tumblers are made with a durable motor that’s designed to last for years. The leakproof rubber barrel reduces sound, making it 75% quieter than other plastic models. Makes an excellent STEM gift or activity for girls and boys.

ALL-IN-ONE TUMBLING KIT - This complete kit has everything you need to create polished gemstones. In addition to the tumbler, four polishing grits, sifter, and rough gemstones, this bundle includes refill packs with 1lb each of rough gemstones and rough jasper. Learn all about the gemstones in your kit with the detailed, full-color learning guide.

STAGE 4 OF 4 STEP ROCK TUMBLING MEDIA GRIT – Two 1.5 lb. jars of Stage 4 media grit for transforming rocks and gemstones into beautiful treasures. Contains a total of 3 lbs. Final Polish 1200 Fine Aluminum Grit.

COMPATIBLE WITH ALL TUMBLERS - Our universal grit is designed for any rock tumbler. Elenco, Lortone, National Geographic, Smithsonian, Thumler and more!

SUPERIOR PACKAGING - Packaged in durable, re-usable jars to prevent messy spills and to safely store unused product for later.

Mega rock tumbler refill pack: Includes everything needed to turn rough rocks into beautiful gemstones. Includes 1/2 lb. assorted gemstones, 4 grit bags, jewelry fasteners. Compatible with all rock tumblers.

9 varieties of gems (0.5 LB): Includes Agate, Amethyst, Aventurine, Dalmatian Jasper, Hematite, Red Jasper, Rose Quartz, Sodalite, Tiger Eye.

4 grit levels: Grade 1: Coarse, Grade 2: Medium, Grade 3: Pre-polish, and Grade 4: Polish.

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

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.

PROFESSIONAL TUMBLING - With its large 2-pound barrel, three selectable speeds; and timer with settings for days and hours, the Ultimate Tumbler delivers spectacular results with unparalleled ease of use!

QUIETEST TUMBLER - The Ultimate Rock Tumbler's all-new design includes a sound-dampening cover that makes tumbling quieter than ever, perfect for enthusiasts who tumble indoors, or in smaller or shared spaces.

ALL-IN-ONE TUMBLING KIT - This kit has everything you need to get started, including one pound of rough rocks, four bags of grit, five jewelry fastenings, a newly designed strainer, and our exclusive GemFoam rock polisher for a brilliant finish!

PROFESSIONAL TUMBLING - The Ultimate Tumbler delivers spectacular results with unparalleled ease of use! With its large 2-pound barrel, 3 selectable speeds; and timer with settings for days and hours.

QUIETEST TUMBLER - The Ultimate Rock Tumbler's all-new design includes a sound-dampening cover that makes tumbling quieter than ever, perfect for enthusiasts who tumble indoors, or in smaller or shared spaces.

ALL-IN-ONE TUMBLING KIT - This kit has everything you need to get started, including 1 pound of rough rocks, 4 bags of grit, 5 jewelry fastenings, a newly designed strainer, and our exclusive GemFoam rock polisher for a brilliant finish!

Create Your Own Gem - Rock tumbling is a hugely popular hobby for kids and adults! This robust rock tumbler makes it fun and easy to turn rough rocks into beautifully polished gemstones, thanks to its simple operation and durable design.

Durable Tumbler - The durable motor has tumbling time control settings so you can set it and forget it. The leak-proof barrel features a stainless-steel lid and is 75% quieter overall than plastic tumbler barrels.

All-in-one Tumbling Kit - This kit has everything you need and then some! You get 227 grams of rough rocks with nine different types of gemstones inside, five jewelry fastenings, tumbler grit, a strainer, and our innovative new gem rock polisher.

【Total of 8 bags】There are 2 bags of each type of grit, totaling 8 bags in the set. This is a supplementary accessory kit for your rock tumbler, providing enough material for 2 complete tumbling sessions.

【The 4-Step Complete Grits Kit 】It is a comprehensive package designed for 4 tumbling stages in your rock tumbler polisher

【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

STAGE 2 OF 4 STEP ROCK TUMBLING MEDIA GRIT – Two 1 lb. jars of Stage 2 media grit for transforming rocks and gemstones into beautiful treasures. Contains a total of 2 lb. Medium 180/220 Silicon Carbide Grit.

COMPATIBLE WITH ALL TUMBLERS - Our universal grit is designed for any rock tumbler. Elenco, Lortone, National Geographic, Smithsonian, Thumler and more!

SUPERIOR PACKAGING - Packaged in durable, re-usable jars to prevent messy spills and to safely store unused product for later.