Cooper CS5 Ultra Touring Radial Tire - 235/55R18 104V Tire only Wear Square visual indicator allows you to approximate remaining tread life on your tires. New generation coupled silica compound provides exceptional all-season performance, improves braking and lowers rolling resistance. 3D Micro-Gauge grooves allow the tread elements of the tire to interlock and stabilizes the tread. Stabiledge enhances steering precision while providing a better feel for the road.