Spitfire X Sci-Fi Fantasy Jerry Hsu Formula Four Classic 52mm 99a Skateboard Wheels (set of 4)
High Rebound Compound
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 Four wheels retained more material, coned less and kept their original shapes and sizes longer than any other wheel.