Wilton Recipe Right Non-Stick Air-Insulated Cookie Sheet, 7  x 11-Inch Get almost perfect cookies every time with this air-insulated cookie sheet Made of steel; non-stick surface for easy release and quick cleanup 17.25 x 11.5 in. (43.8 x 29.2 cm) Limited 5-year warranty Dishwasher safe; however for best results, wash in warm, soapy water before first and after each use