Calphalon?'s Tri-Ply combines the best qualities of stainless steel and aluminum cookware! It incorporates the beauty of a mirror-polished, 18/10 stainless steel exterior with the superior conductivity and performance of a permanently bonded, heavy gauge aluminum core. Designed for comfort with a flared rim, ergonomic cool "V" handle and a domed, tempered glass cover. Stainless interior is nonreactive to foods, so your recipes taste better. Best of all ? Tri-Ply cookware is completely dishwasher safe! Manufacturer's lifetime warranty.