16 gauge Anodized Aluminum ~ Straight sides ~ Hemmed rim for durability ~ Even wall thicknessOne ea. 11 x 8 x 4 x 3, 13 x 10 1/2 x 5 1/4 x 3, 15 x 12 1/2 x 6 1/4 x 3, 17 x 15 x 7 1/2 x 3 Fat Daddio¦s bakeware is covered by an unconditional lifetime warranty against defects, failures, or workmanship issues. Fat Daddio¦s baking pans are anodized. This anodizing etches the surface of the pan removing inconsistencies and impurities from the natural aluminum. Further, anodizing penetrates the surface of the metal creating a surface that is harder than stainless steel. It also ensures that the pan is dishwasher-safe and will not stain or discolor like natural aluminum pans. Additionally, anodizing will not alter your baking times or temperature