NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit - Gemstone Mix of 9 varieties including Tiger's Eye, Amethyst and Quartz - Comes with 4 grades of Grit, Jewelry Fastenings and detailed Learning Guide

NATIONAL GEOGRAPHIC Rock Tumbler Refill Kit – 1Lb. Gemstones and Rocks for Tumbling including Unpolished Amethyst and Quartz – Rock Tumbler Supplies include Rock Tumbler Grit and Jewelry Accessories

NATIONAL GEOGRAPHIC Starter Rock Tumbling Kit - Durable Leak-Proof Polisher for Kids Complete Geology Hobby Science Kit, Rocks and Crystals Kids, A Great STEM Activity

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