Manufactured to meet the exacting standards of the toughest commercial bakeries. Crafted from heavy-gauge aluminized steel, a 3-ply material consisting tough corrosion-resistant 18-gauge 3003 aluminum alloy around a carbon steel base. The frame is supported by a thick, coated reinforcing wire to give the pan additional strength and durability. Bottom of pan is concave and will flatten during heating for even distribution. Measures 18-in x 13-in x 1-in.