Half Round Kiln Shelf (26-1/2")Made of a clay body with a much higher amount of alumina, this High Alumina kiln shelf is more resistant to high temperatures. It is also stronger than regular cordierite kiln shelves because it is pressed, not cast, into molds. Its smooth finish makes it great for ceramics or glass firing. Highly recommended for gas kilns, and for electric kilns from low fire to cone 10. Dimensions: Half Round 26 1 2" diameter x 3 4" thick Standard Material: High