The Rock Tumbler by Elenco Electronics is an amazing gift for kids who dream of turning something rough into something polished. The Rock Tumbler by Elenco enables you to create stunning jewelry with gem-like polished stones as well as stimulates an interest in natural science! This amazing rock tumbler kit contains 8 oz. gemstone rocks, coarse grinding powder, fine grinding powder, polishing powder and fine polishing powder . The jewelry making includes an 18� silver tone necklace chain, 4 adjustable rings, 3 key chains, 3 pairs hanging earring wires, 12 setting holders in 3 styles, 12 jump ring connectors and glue. The ac adapter is also included and batteries are not required!Ages 10 and up.By Elenco Electronics