A USA Pan rectangular cake pan. Aluminized steel with Americoat silicone nonstick. Baking surface 9" x 13" x 2.25"; outer 9.5" x 13.625" x 2.25". Square corners; corrugated floor; steel-wire rim. Oven-safe to 450°F. Silicone, nylon, or wooden utensils only. Limited lifetime warranty. USA Pan's FAQ lists Americoat as a silicone coating made without PTFE, PFOA, PFOS, PFAS, and BPA.
Square corners if you want tidy edges on bars or a sheet cake.