The plate is made of stainless steel. Thickened stainless steel material, no rust, corrosion resistance. Drawing polishing process, fine grinding texture is very delicate, not easy to deformation, easy to clean. Fall resistant and durable. The edges are rolled up so you don't hurt your hands. Available in 12 sizes from 5.51 inches to 19.68 inches. It's listed at 7.87 inches.