Calphalon Tri-Ply Copper 4-Quart Chef's Casserole with Stainless-Steel Lid Handsome 4-quart chefs casserole with rolled edge and stainless-steel lid Copper exterior, heavy-gauge aluminum core for superior heat retention, satin finish 18/10 stainless-steel interior Riveted handles stay cool on stovetop; lid is safe to 450 degrees F; pan is broiler-safe uncovered to 550 degrees F Hand-wash with mild detergent; if desired, patina removes with copper polish Measures 13-1/2 by 5-1/2 inches; lifetime warranty; made in China