EXCEPTIONAL NON STICK: with 2 layers of Quantum II non stick, this deep cake tin releases food easily and cleans in seconds. ROBUST: the cake pan is made of 1 mm-thick, warp-resistant carbon steel, which is oven safe to 220C (428F). LOOSE BOTTOM: the pop-up base ensures neat results, so it's ideal for baking impressive middle tiers, or small fruit or sponge cakes. USEFUL INFO: MasterClass's deep cake pans are 100% BPA, PTFE and PFOA free; dishwasher safe; diameter: 18cm (6 inches). MasterClass Non-Stick Loose Base Deep Cake Pan, Carbon Steel Round Cake Tin, 18cm in Dark Grey