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Amazon.com: NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit – Rock Tumbling Supplies including Rock Tumbler Grit and Polish Refill, Ceramic Media, GemFoam, 3 lbs Madagascar Rocks for Tumbling, Jewelry Accessories : Toys & Games
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Amazon.com: 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 : Toys & Games
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National Geographic Grit Refill for Rock Tumbler — Brainfuel Toys | Educational STEM Toys for Kids, Parents, & Teachers
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