The Rink Rat Crossbar Pro Goalie Hockey Wheel utilizes Rink Rat's Interlock Hub technology in collaboration with a single-pour urethane to provide unmatched durability and performance. The Interlock Hub technology means the urethane is poured through the hub, creating a stronger bond between the hub and urethane. After rigorous testing and several prototypes, Rink Rat found the wheel that recorded the best results among their play-testers. Rink Rat's testers said that the wheel out performed previous models and offered great response when pushing side-to-side.