"The National Geographic Starter Rock Tumbler kit is a fantastic way to start an exciting new rock tumbling hobby! This kit has all the features and accessories you'll need to transform rough rocks into extraordinary gemstones start an awesome rock collection and create beautiful jewelry. From the leakproof tumbling barrel to the four-stage grit polishing system to the ? pound of rough rocks you'll be all set! Five jewelry settings let you make beautiful pieces from your favorite stones and easy-to-follow instructions help you become a tumbling expert in no time • Complete rock tumbling kit with tumbler rough rocks polishing grit jewelry fastenings instructions and a learning guide • An easy-to-use way to start a fun hobby that can last a lifetime. • Compatible with all National Geographic rock tumbling accessories • Detailed learning guide teaches about natural rock polishing processes and more