UPGRADED HEAVIER AND THICKER GRATE BARS The gas range center burner grates are made of matte enamel cast iron and it heavier than others, more durable and long-life lasting. The cast iron gas burner rack are less likely to scratch up your cookware, easy to clean. EXTRA PROTECTER We have installed the grate rubber feet in the gas stove grate hole. So if you slide full pots around on the cook top they won t shuffle around underneath and provide protect to your range surface. The gas stove burner grate set provides a stable surface for cookware on the surface range oven burner and they hold heat and radiate it into your cookware stes. This makes cooking on them slightly more efficient.