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The Spitfire F4 wheels are crafted for high performance using premium Formula Four urethane. This urethane formula offers exceptional durability, resisting wear and flat spots longer than other wheels, even under the toughest conditions. Engineered to deliver all the key attributes of a high-performance wheel without compromising on any aspect, Formula Four wheels utilize a 100% pure urethane compound. They provide a higher rebound for faster speeds on both rough and smooth surfaces, with a hard durometer that ensures a smooth, fast ride without losing firmness over time. These wheels feature an exclusive anti-stick compound, guaranteeing a fast, consistent, and smooth slide from start to finish.