From Spitfire, the Firebolt 51mm skateboard wheels are made using white 99a urethane. Made with the brand’s OG Classic shape for all-around skating, the skate wheels are finished with red lightning graphics printed along the side walls. Spitfire’s classic urethane design Spitfire’s hard polyurethane core for a true bearing seating and speed Unmatched flat spot resistance Includes 4 urethane wheels 51mm size 99a durometer rating 100% urethane Made in the USA