A-A-53389 Stone, Artificial, DentalThis commercial item description covers artificial dental stones suitable for making dental stone casts and dies. The stones shall be furnished in the following types and nominal sizes, as specified: Type I. - High strength stone Size 1. - 50 grams Size 2. - 4 1/2 pounds Size 3. - 35 pounds Type II. - Low strength stone Size 3. - 35 pounds Size 4. - 25 pounds.