The Hookworm features a hard 70a black compound for street, flatland, and ramps. With an unmistakable tread pattern, the Hookworm tire is standard equipment for serious freestyle riders. The high performance qualities of the grooved tread pattern allow straight line performance and cornering control. The Hookworm is high pressure rated at 110 PSI, which rolls fast and reduces the risk of pinch flats. Features Benefits: Curved grooved slick design. High rated pressure 110 PSI. Rim to rim tread protected sidewalls.