"A sheet pan, baking tray or baking sheet is a flat, rectangular metal pan used in an oven. It is often used for baking bread rolls, ...
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pastries and flat products such as cookies, sheet cakes, Swiss rolls and pizzas.
These pans, like all bakeware, can be made of a variety of materials, but are primarily aluminum or stainless steel. The most basic sheet pan is literally a sheet of metal. Commercial pans are sometimes made from aluminized steel which combines the conductive, reflective, and food adherence properties of aluminum, with the rigidity, mass, and strength of the inner steel core (in this process, the aluminum surface is typically 90% aluminum and 10% silicon, which is not quite the same as pure aluminum)." - (en.wikipedia.org 24.01.2022)
