National Geographic Hobby Rock Tumbler Kit - Includes Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, and Detailed Learning Guide - Great Stem Science Kit for Geology Enthusiasts

National Geographic Hobby Rock Tumbler Kit - Includes Rough Gemstones, 4 Polishing Grits, Jewelry Fastenings, and Detailed Learning Guide - Great Stem Science Kit for Geology Enthusiasts

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