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Blue Marble

Blue Marble National Geographic Rock Tumbler Grit and Polish Refill Kit - Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with Any Rock Polisher, Rock Tumbler Supplies

  • Based on 18,118 reviews
Condition: New
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Availability: Only 5 left in stock, order soon!
Fulfilled by Amazon
Arrives Sunday, Nov 2
Order within 9 hours and 25 minutes
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Style: Bulk Grit Media


Features

  • 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
  • EASY TO MEASURE AND STORE - Each rock tumbling grit stage is packaged in a wide-mouth container with secure, screw-top closure.
  • 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!

Product Dimensions: 5.5 x 5.5 x 4.25 inches


Item Weight: 3.92 pounds


Item model number: NGBULKGRIT


Manufacturer recommended age: 14 years and up


Is Discontinued By Manufacturer: No


Release date: August 9, 2017


Language: English


Manufacturer: JMW Sales, Inc.


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Nov 2

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Gem Foam Works Well
Style: New Polishing Foam
final polish on the stones look really good. easy instructions.
Reviewed in the United States on August 17, 2025 by J Moore
    • Very convenient
Style: Bulk Grit Media
Everything is included except the rocks, tumbling compound an water. Good clear instruction. You may want to experiment with the length of tumbling with each grit you use based on the subject you are polishing. Good, clear instructions.
Reviewed in the United States on July 21, 2025 by Sire786
    • EZ directions. EZ to store.
Style: Complete Media Kit
Easy to use. Directions are clear. Tumbling my first batch of rocks. I like that the grit is in plastic jars and easy to store.
Reviewed in the United States on July 11, 2025 by Michelle Bland
    • A good product
Style: Bulk Grit Media
On time and as described, it works well!
Reviewed in the United States on July 23, 2025 by Randy Warwick
    • Does the job
Style: Bulk Grit Media
Decent quality and price. Good selection of grits
Reviewed in the United States on April 28, 2025 by Richard G. Evansii
    • Great set
Style: Bulk Grit Media
My daughter was so excited to refill her rock tumbler. This set works great.
Reviewed in the United States on August 19, 2025 by Jessica M Cloy
    • Perfect for rock polishing
Style: Bulk Grit Media
Arrived as expected. Previously purchased and can’t wait to use again.
Reviewed in the United States on August 11, 2025 by Sarah
    • Grit
Style: Bulk Grit Media
Tumbler grit is great. Each step takes the rocks to a nice finish.
Reviewed in the United States on July 20, 2025 by Patricia DeAnda

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