Spitfire Formula Four Glow in the Dark Classics. Unmatched Speed and Control on all surfaces. Unmatched Flatspot Resistance. Smooth Anti-Stick Slide. High Rebound Compound. 100% True Preformance Urethane. The Spitfire Classic is the #1 wheel shape in skateboarding. medium riding width surface with round sidewalls. Designed for control in all situations.