The Calphalon Contemporary Stainless Steel 2.5-Quart Sauce and Double Boiler feature clean lines and curves crafted from lustrous, brushed stainless steel combine sophisticated style with the professional performance you expect from all Calphalon cookware. A heavy-gauge aluminum core is sandwiched between two layers of stainless steel by means of high-heat, high-pressure impact bonding for extreme durability. Aluminum core provides superior conductivity and even heating for excellent browning and control of the cooking process. Non-porous stainless steel cooking surface is safe for use with all utensils. Clear tempered-glass lids let you see food while it's cooking and are oven safe, so you can finish covered dishes in the oven or keep them warm until ready to serve Long, brushed stainless steel handles stay cool on the stovetop. All cookware is dishwasher-safe and carries Calphalon's full lifetime warranty.