GrillGrates are the No. 1 ranked grill surface in America! Made in the USA from hard anodised aluminium which will never rust, they have patented raised rails with a flat base plate interspersed with holes for airflow. It is this design that amplifies the heat and eliminates hot-cold spots, whilst the bottom plate protects food from flare-ups. In addition, drippings are vaporised in the valleys adding flavour and moisture to the food. For an added boost of smoky flavour, you can sprinkle some wood pellets in the valleys. The raised rails create perfect sear marks on food, however, you can reverse the panels if you wish to use a flat griddle surface. Through use and over time the GrillGrate will season, enhancing the non-stick properties. This GrillGrate set is compatible with 2007-2016 Weber Genesis (does not fit newer Genesis II models) and Broil King Baron and is designed to replace the existing stock grates. For pellet grills with a smokestack, place the GrillGrates on the stack side.