12" x 12" x 1" (305 x 305 x 25mm). Create drape, slump and casting molds with Kaiser Lee Board. Cut the thick board to any free formed shape to make custom molds. It does not absorb heat like other mold materials or kiln shelves. Will not interfere with the heating and subsequent cooling process of your project, ensuring even heat distribution and less stress on the glass. No mixing, pre-firing or secondary materials required. Price is per sheet.