Calphalon One Nonstick 11-Inch Square Grill 11-by-11-inch square griddle combines two technologies for unparalleled nonstick cooking Four interlocking nonstick layers on interior; advanced release polymer to prevent staining on exterior Stainless-steel ergonomic handle stays cool For gas, electric, ceramic stovetops; oven-safe to 500 degrees F Hand-washing recommended; lifetime warranty; made in USA