Rock tumbling is a fun way to start a beautiful rock collection! This Hobby Rock Tumbler Kit from National Geographic includes all the accessories you’ll need to start polishing dazzling gems. Kids can use the included jewelry fastenings to create beautiful homemade jewelry! This high-quality tumbling machine boasts a powerful motor that will last for years; an automatic shutoff timer; and a noise-reducing, leak-proof barrel with stainless steel lid. Plus, everything is included to get started: a 1/2 pound of assorted stones from around the world, 4 stages of polishing media, and jewelry fastenings to you can create your own unique wearables with your tumbled gems. Rock tumbling is a fun activity for children of all ages and promotes an interest in geology and science! Join National Geographic as we inspire future generations by showing them the wonders of the natural world. We make the highest quality hands-on science toys, and all products are backed by exceptional service. With a mission to inspire people to care about the planet, the National Geographic Society is one of the world's largest nonprofit scientific and educational organizations.