Designed for kids ages 8 and above, Science Can rock tumbler kit is suitable for beginners to have a unique, hands-on experience that allows children to explore the mysteries of the geography. Just 2 days, create your own dazzling gemstones from rough rocks in a fun way. Kids will enjoy collecting and polishing gems while learning how gemstones are made. With this set, you’ll receive 9 rough gemstones a full pouch of rough gems and polishing grits, a noise reduction cover, storage bag and more! A Complete hobby tumbling kit Make any stone sparkle and polish everyday rocks into dazzling gemstones! This rock tumbler kit makes it fun and easy to turn rough rocks into beautifully polished gemstones.