Cooper Zeon RS3-A Radial Tire - 255/45R18 103Z XL Tire only Advanced technology mold profile provides for a square tread footprint which means more tread-to-road contact. Silica formulated tread compound is designed for exceptional all-season driving performance. 3-D micro-gauge siping increases tread element stability, improves handling and tire control while reducing the possibility of stone retention. Asymmetric design allows for tread pattern tuning.