Calphalon One Nonstick 12-Inch Flat-Bottom Wok with Glass Lid 12-inch wok with glass lid combines two technologies for unparalleled nonstick cooking Four interlocking nonstick layers on interior; advanced release polymer to prevent staining on exterior Glass lids oven-safe to 450 degrees F; stainless-steel ergonomic handles stay cool For gas, electric, ceramic stovetops; safe for use with nylon, plastic, and wood utensils Hand-washing recommended; oven-safe to 500 degrees F; lifetime warranty; made in USA