Weber Series Gas Grills (17.5 x 11.9 x 0.5) 7638 Porcelain-Enameled Cast Iron Cooking Grates for Spirit 300 2-Pack of cooking grates Porcelain-enameled cast iron. Care Instructions : Preheat on high for 15 minutes and brush clean with a grill brush Individual carton dimensions 20.2H x 1.3W x 14.1D inches Fits- Spirit 300 series, Spirit 700, Genesis Silver B/C, Genesis Gold B/C, Genesis Platinum B/C (2005 model year) and Genesis 1000-3500 gas grills