These brand new Spitfire wheels are built to last! Coming in at 52mm in diameter and 99a in hardness, these bad boys are ready for action and packed with steez. Spitfire Wheels Formula Four Classic Thrasher Flame Natural Skateboard Wheels - 99a are sold in (1) set of four (4) wheels. You know, because that's how many wheels you need on a skateboard. Speaking of skateboards