With a square edge and a traditional rounded edge, Spitfire Formula Four 99D Lock-ins Skateboard Wheels are designed to keep you glued to rails, coping, and ledges longer than ever. They're made with a long-lasting urethane that resists flat spots and helps you roll on forever.
99a Durometer – More speed and control on all surfaces. Unmatched flatspot resistance. Smooth, anti-stick ride. High-rebound compound.
Lock-In Shape – Asymmetrical shape and design, featuring a conical cut profile opposite a straight edge side so you can lock on in.