Expertly designed for superior performance, the Spitfire Wheels Nicole Hause Kitted 56mm 99a in Black is a set of 4 wheels that will transform your skateboarding experience. With its high-quality material and precise construction, these wheels offer increased speed, control, and durability on any surface. Take your skills to the next level with Spitfire. Diameter: 56mm Durometer: 99a Contact Patch: 21mm Nicole Hause Pro Wheels Construction: Spitfire Formula Four Classic Package Size: Set of 4