The National Geographic World’s Greatest Rock Tumbler Refill Kit includes an astounding 5 pounds of unpolished rocks and gemstones along with everything you need to make the stones shine! This Kit Includes: 1 Pound Gemstone Mix, 1 Pound Agate Mix, 1 Pound Madagascar Mix, 1 Pound Petrified Wood Mix, 1 Pound Jasper Mix, 5 Jewelry Settings, 20 Rock Polishing Grit Packets, 1 Learning Guide with Instructions. This is the ultimate rock tumbler refill kit for tumbling enthusiasts. You receive an incredible array of stones including agates, jasper, and petrified wood. The gemstone mix includes aventurine, amethyst, sodalite, and tiger’s eye. The Madagascar mix contains rose quartz, labradorite, and indigo gabbro. This truly is a one stop refill kit, packed with a wide-ranging variety of rocks and gemstones! Plus, the 20 polishing grit packets allow for five complete rock polishing cycles with any rock tumbler. A handy storage pouch is also included so you can keep all your favorite specimens together in one place. And a detailed learning guide provides tumbling instructions along with fascinating facts about all the stones in the kit. National Geographic Toys is proud to provide a 100% satisfaction with all our products so you can buy with confidence. About the National Geographic Society: 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.