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Natural, close-density oilstones with qualities that make them unequalled for sharpening tools such as gravers, knives, etc. Hard (fine).
Proposition 65 Warning for California Consumers:
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size) which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov