E UNCOATED ALUMINUM & SUPERIOR HEAT CONDUCT: Crafted from bare aluminum with NO chemical coatings – s safe,toxin-cooking. Engineered for -fast,even heat distribut (up to 30% faster than steel!). Foods bake evenly due to aluminum’s superior heat conductivity EAVY-DUTY 18-GAU CONSTRUCT (0.8mm" THI) – RESISTS WARPING!