Great way to start a rock collection! Learn about the exciting hobby of rock tumbling with National Geographic. This set includes all the accessories you ll need to start polishing dazzling gems. Rock tumbling is tons of fun and a great way to start an extraordinary rock collection. Use the included jewelry fastening to create beautiful homemade jewelry! Rock tumbling is a fun activity for children of all ages and promotes an interest in geology and science. About the National Geographic SocietyWith a mission to inspire people to care about the planet, the 126-year-old National Geographic Society is one of the world s largest nonprofit scientific and educational organizations. National Geographic s net proceeds support vital exploration, conservation, research, and education programs. FeaturesGreat way to start a rock collection! Learn about the exciting hobby of rock tumbling with National Geographic. This set includes all the accessories you ll need to start polishing dazzling gems. Rock tumbling is tons of fun and a great way to start an extraordinary rock collection. Use the included jewelry fastening to create beautiful homemade jewelry! Rock tumbling is a fun activity for children of all ages and promotes an interest in geology and science. About the National Geographic SocietyWith a mission to inspire people to care about the planet, the 126-year-old National Geographic Society is one of the world s largest nonprofit scientific and educational organizations. National Geographic s net proceeds support vital exploration, conservation, research, and education programs.