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Amazon.com: NATIONAL GEOGRAPHIC Rock Tumbler Kit - 3 Lb. Extra Large Capacity Barrel with 3-Speed Motor & 9-Day Timer, Kit Includes Rocks for Tumbling and Rock Polisher Grit, Rock Tumbler for Adults
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NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Durable Leak-Proof Rock Polisher with 7-Day Timer - Complete Rock Tumbling Kit - Geology Hobby for Kids, Educational STEM Science Kit, Rock Collection, Rock Tumblers -
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