Porous, light weight. Combines the best features of rigid hard trays and soft liners. Bottom channels provide instant heating and cooling. Convenient and fast. Porcelain and molten metal will not stick to tray. Fire cases of any size and shape directly on it. No pins or pegs. Long service life, will not fracture in the furnace or during cooling. Thermal shock resistant. Light and easy to handle. Holes can be drilled into trays with a fine bur to create custom supports. Round trays conform to most modern surface designs. Square trays fit square muffles and round muffles with 3 1/2" diameter, and allows the largest number of units to be fired simultaneously. 2 1/2" diameter 2 round trays per box
