These brand new Cyrus Bennett Spitfire wheels are built to last! Coming in at 53mm in diameter and 99a in hardness, these bad boys are ready for action and packed with steez. Spitfire Wheels Cyrus Bennett F4 Burn Squad 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.