Ceramic mold from Bullseye has an exceptionally smooth surface, accepts kiln wash uniformly, and will not crack under repeated usage when handled properly. Individual molds may have slight variations in dimensions shown. Mold measures 11-1/2" round by 3-3/8" deep.
Always elevate molds with kiln posts for good circulation, and don't forget that molds should be drilled to vent air.
Size perspective illustrated in additional images with coin. Project image provided courtesy of Bullseye Glass Co.