NATIONAL GEOGRAPHIC Rock Tumbler Grit and Polish Refill Kit – Tumbling Grit Media, Polish Up to 20 lbs. of Rocks, Works with any Rock Polisher & Tumbler Supplies

Price: $24.99 - $19.99
(as of Dec 15, 2025 18:03:45 UTC – Details)

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Every purchase helps support the global nonprofit National Geographic Society in its work to protect and illuminate our world through exploration, research, and education.

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!