The Spitfire Bigheads are a set of 57mm skateboard wheels by Spitfire. Spitfire urethane was developed to combine all the desired properties of a performance wheel without sacrificing any one attribute at the expense of the customer. The original Spitfire head is one the most recognisable logos in the history of skateboarding. Features: size - 57mm Durometer - 99a Spitfire Bighead Skateboard Wheels White/Sky Blue 57mm