The Jamie Oliver square cake pan is made of heavy-gauge 0.6mm Carbon steel construction for even heat distribution. The 8 inch length and 3 inch high walls allow for baking deep dishes. Durable nonstick quantum ii coating on interior and Xylan coating on exterior keeps food from sticking. This new range of baking tins is a home baker's dream. Each piece has been smartly designed to help turn out showstopper cakes and melt-in-mouth dishes time after time. Designed to withstand temperatures of up to 475 degrees f, the Jamie Oliver bakeware range won't warp. The heavy-duty carbon steel and non-stick coating means it's made to last, so we've popped a 25 year guarantee on it to prove it.