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  • VIDEO
  • National Geographic Rock Tumbler Media – Rock Polishing Supplies Kit, 4 Stage Silicon Carbide Bulk Grit, 680 g of Ceramic Pellets, GemFoam Polishing Tumbling Media
  • National Geographic Rock Tumbling Accessories & MediaNational Geographic Toys

National Geographic Rock Tumbler Media – Rock Polishing Supplies Kit, 4 Stage Silicon Carbide Bulk Grit, 680 g of Ceramic Pellets, GemFoam Polishing Tumbling Media

4.7 out of 5 stars (30)
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Purchase options and add-ons

  • QUALITY GRIT RESULTS IN A DAZZLING POLISH - The rock polishing grit in this pack is high-quality silicon carbide and will polish 3.6-4.5 kg of rocks, includes measuring scoop and storage containers with secure screw-top closures for easy storage.
  • 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.
  • BRAND NEW WAY TO MAKE TUMBLED ROCKS SHINE – GemFoam is a unique new rock polisher media that gives unprecedented shine to tumbled rocks. Just add the patent-pending rock polishing media to your tumbler after the final grit cycle for great results!
  • WORKS WITH ANY ROCK TUMBLER – The tumbling supplies in this set are safe to use with any rock tumbler. The tumbling grit, ceramic pellets, and GemFoam together improve rock tumbling performance and yield impressive results.
  • AWARD-WINNING PRODUCTS - Blue Marble, winner of the Toy Association's prestigious Toy of the Year Award, proudly develops products that foster education, imagination, and creativity, with a U.S. support team to ensure a stellar experience!
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Product information

Technical Details

Educational objective(s) ‎Develop understanding of geological processes and mineralogy through hands-on rock tumbling activities.
Model Number ‎CANGFOMCERGRIT6L
Assembly Required ‎No
Batteries Required? ‎No
Batteries Included? ‎No
tech_spec_battery_description_toys ‎No batteries required
Material type(s) ‎Clay, Aluminum oxide, Silicon carbide
Colour ‎Multicolour
Manufacturer recommended age ‎8 years and up
Item model number ‎CANGFOMCERGRIT6L
Product Dimensions ‎19 x 13.49 x 13.89 cm; 2.52 kg
ASIN ‎B0FLBDJD7T

Additional Information

Customer Reviews
4.7 out of 5 stars (30)

4.7 out of 5 stars
鶹 Rank
Date First Available Aug. 14 2025
Manufacturer JMW Sales, Inc.
Place of Business Blue Marble, 101 A St., Ashland, OR 97520 USA, help@thinkbluemarble.com

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National Geographic Rock Tumbler Media – Rock Polishing Supplies Kit, 4 Stage Silicon Carbide Bulk Grit, 680 g of Ceramic Pellets, GemFoam Polishing Tumbling Media

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Product Description

National Geographic Rock Tumbling Media Refill Kit

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

National Geographic Rock Tumbling Media

Merchant video

Keep your tumbling hobby rolling with this ultimate polishing supplies pack, including 4 stages of silicon carbide polishing grit compound, 680 grams of ceramic media, and 30 grams of our patented GemFoam for an incredible shine on your tumbled gems!

All the accessories you need to dramatically improve your polishing results!

The National Geographic Rock Tumbler Supplies pack includes all the rock tumbling accessories you need to dramatically improve your rock polishing results!

This Complete Media Kit Includes: 4 Stages of Silicon Carbide, Polishing Grit Compound, 680 g of Ceramic Media, 30 g GemFoam, 10 mL Scoop, easy-to-follow Instructions.

Our 4-stage bulk rock tumbling grit is high-quality silicon carbide, perfect for polishing rough rocks into smooth gemstones. The first rock tumbler grit stage provides initial shaping, the second smooths rock surfaces, the third pre-polishes rocks, and the fourth provides the final polish. Grit comes packaged in secure, screw-top containers for easy storage. When you add our ceramic tumbling pellets to the mix, you will see even better results! Ceramic media helps to more effectively distribute grit to rock surfaces during tumbling, reduces tumbler noise, serves as filler for smaller batches, and reduces rock breakage through every grit cycle.

One of the most exciting elements of this tumbling accessories pack is our new patent-pending GemFoam. This tumbling media was specially designed to add dazzling shine to polished stones. Simply add GemFoam, water, and rocks to the tumbler barrel and in a few days your stones will have a high-quality polish. Instructions inside the kit detail how to use all the tumbling media for optimal results.

This pack is compatible with all rock tumblers, but for best results use with National Geographic rock tumblers and tumbling accessories.

We make the highest quality hands-on science toys, and all products are backed by exceptional support. With a mission to inspire people to care about the planet, the National Geographic Society is one of the world’s largest nonprofit scientific and educational organizations.

national geographic stem toys, craft kits and activities for kids
national geographic stem toys, craft kits and activities for kids
national geographic stem toys, craft kits and activities for kids
national geographic stem toys, craft kits and activities for kids
national geographic stem toys, craft kits and activities for kids

Product details

  • Product Dimensions ‏ : ‎ 19 x 13.49 x 13.89 cm; 2.52 kg
  • Mfg Recommended age ‏ : ‎ 8 - 99 years
  • Item model number ‏ : ‎ CANGFOMCERGRIT6L
  • ASIN ‏ : ‎ B0FLBDJD7T
  • Country of origin ‏ : ‎ China
  • Customer Reviews:
    4.7 out of 5 stars (30)

WARNING:

CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Important information

Safety Information

No Applicable Warning

Directions

1. Remove the rock tumbler media kit from its packaging. 2. Follow the instructions inside the kit to use the rock polishing grit, ceramic pellets, and GemFoam for optimal results. 3. For best results, use with National Geographic rock tumblers and tumbling accessories.

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