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Poured with Spitfires Formula Four urethane, Spitfire Lock-In Full wheels are a wider version of the Lock-In Shape. Asymmetrical design with conical cut outside for less weight. Straight edge lock-in inside for control on all terrains. Formula Four urethanes high rebound compound features unmatched flatspot resistance and smooth anti-stick slide. 55mm x 39mm, 99A.