The National Geographic Rock Tumbler, Card Game and Specimen Kit lets kids have endless amounts of fun with geology! This combo pack contains a complete rock tumbling kit, with everything kids need to turn rough rocks into smooth, polished gemstones. They’ll simply add the unpolished rocks included in the kit to the leak-proof tumbling barrel, add grit and water, then let the good times roll! Kids will tumble rocks through four stages of grit, transforming the stones into treasures they’ll absolutely love! There’s also five jewelry fastenings, so kids can take their favorite gems and turn them into wearable pieces of art! The fun doesn’t stop there. While their rocks are tumbling, kids can learn all sorts of fascinating geologic facts with the special playing card deck in the kit. Each of the 52 cards has an image of a gemstone and a cool science fact, making this deck perfect for memory games, trivia, as well as any traditional card game! Kids will also get almost half a pound (170 g) of assorted, polished gemstones, so they can see genuine examples of the gems described on their cards. Get the National Geographic Rock Tumbler, Card Game and Specimen Kit today and give kids an incredible STEM adventure into the wonderful world of geology!