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Silicon carbide is the abrasive of choice for tumbling because it has a Moh's hardness of 8+, incredible longevity, and is quite effective. This 800 & Finer Silicon Carbide Tumbling Grit has a fine grain and is typically used in Step 3 of the tumbling process. The 1 lb. package will process 10 - 14 pounds of rock. This product is graded, with a tight range in grit size.