The C3 is a tire specifically designed for carpet tracks, and it has a unique tough rubber compound formulated for high-competition carpet racing. New improved compound improves traction but at the same time makes the car more stable and easier to drive. The lifetime and reliability of the rubber is significantly improved as well.Set of 4 tires includes inserts, and are precision pre-glued on HUDY touring car wheels moulded from our own composite mixture to ensure true fit, vibration-free running as well as proper hardness matched to the tire compound. The new wheel material improves durability.An overall no-compromise, high-competition racing tire with maximum traction and unmatched stability.