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National Geographic GemFoam rock tumbling media will make your tumbled rocks sparkle like never before! This Kit Includes: 30 grams GemFoam, Mesh Storage Bag, and Easy-to-Follow Instructions. Simply add the patent-pending GemFoam to your tumbler after the final grit polishing cycle is complete and in just a few days, your rocks will have a lustrous polish and shine. GemFoam is a truly unique way to improve your rock tumbling results and it works with any tumbler. GemFoam is also reusable up to 6 times and is easy to use as well as simple to clean and store thanks to the reusable mesh storage bag. For best results, use with National Geographic tumblers and rock tumbling accessories like our ceramic pellet media, bulk rock tumbling grit, and rock refill packs. National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service. 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.