Spitfire Formula Four Classic Radioactive 99a 56mm Skateboard Wheels howl Within the board’s contact points

Within the board’s contact points

Nai Airpill sunshine patch included as a tasty garnish

- Die Cut EVA Insole with Size Shims

- Therma-Pocket to Keep your Device Warm

Spitfire Formula Four Classic Radioactive 99a 56mm Skateboard Wheels howl Within the board’s contact pointsBust out the blacklight and blow some minds at the skatepark with the Spitfire Formula Four 99d Bighead Radioactive Skateboard Wheels. Spitfire's iconic Formula Four urethane is simultaneously smooth, fast, and tough, paired with the slightly wider Bighead profile a sick Radioactive colorway. Bighead Shape Formula Four Urethane Formula Four urethane is unlike any other. Both in the streets and under high speed stress tests in Spitfire's lab, Formula