NATIONAL GEOGRAPHIC Starter Rock Tumbler Kit MAKE ANY STONE SPARKLE and polish everyday rocks into dazzling gemstones ENHANCE YOUR ROCK COLLECTION or start a new one! Makes all rocks shine like professionally polished stones EVERYTHING IS INCLUDED in the kit; tumbler, four polishing grits, a sifter, jewelry settings, a full-color 8-page learning guide and nine types of REAL rough gemstones EASY TO USE for Rock Hounds of all ages and skill levels; plug it in and polishing begins 100% SATISFACTION GUARANTEED - For 129 years, National Geographic has been committed to providing fun and fascinating educational opportunities for children and stands behind this Rock Tumbler with a two-year warranty