A USA Pan rectangular cake pan (SKU 1110RC-1). 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. Official page lists cakes, brownies, focaccia, cinnamon rolls, casseroles, and pasta al forno. Oven-safe to 450°F. Hand wash; official use-and-care says do not dishwasher and not to use cooking spray. Silicone, nylon, or wooden utensils only. Limited lifetime warranty. Made in the USA from globally sourced materials. USA Pan's FAQ lists Americoat as a silicone coating made without PTFE, PFOA, PFOS, PFAS, and BPA. Specs from USA Pan's rectangular cake pan page.

The 9x13. Square corners if you want tidy edges on bars or a sheet cake.