National Geographic Rotating Hobby Rock Tumbler - Learn about the exciting hobby of rock tumbling with National Geographic. This set includes all the accessories you'll need to start polishing dazzling gems. Rock tumbling is tons of fun and a great way to start an extraordinary rock collection! Powerful motor that will last for years Automatic shutoff timer Noise reducing, leak-proof barrel with stainless steel lid Nine types of gemstones from around the world Four grades of grit: coarse, medium, fine, and polish Jewelry settings include ring, earrings, keychain, and necklace Full-color information guide features facts about each gemstone Easy-to-follow instructions. Ages 14+ Total gemstone weight: 1/2 lb. 6in H x 6in W x 8-1/2in D Imported