These Spitfire Formula 4 Classics come in at a 58mm diameter and 99a durometer making it a pro wheel stable for skating street, skate parks and bowls!The Spitfire Formula 4 Classics are built to excel with its signature Formula 4 design. Formula Four Urethane was developed to combine all the desired properties of a performance wheel without sacrificing any one attribute at the expense of another!

Features:

• Diameter: 58mm
• Durometer: 99a