High quality silicon carbide grit. This kit comes with enough grit to complete approximately 8-10 lbs. of rocks.

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4 Courses of grit take your stones from rough material to polished gems over a 4-step tumbling process

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COMPATIBLE with all kits. Use this grit for tumbling rocks in any brand of rock tumbler. Lorton, Tumbler, National Geographic, Elec, Smithsonian and more!

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POLISH rocks of many varieties including quartz, jasper, tigeru0026#39;s eye, and more

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Recommended use: we recommend approximately 2 tablespoons of grit per pound of rocks.

nThis grit is perfect for use with rock tumblers of any brand! take your stones from rough rocks to polished gemstones in just 4 easy tumbling step using National Geographic grit refill (rock tumbler required and sold separately). this product contains 4 stages of grit in easily resalable containers - enough for about 8-10 pounds of rocks. Feel free to contact National Geographic toys on Amazon if you have any addition questions and we'll be happy to help.