99a Durometer – More speed and control on all surfaces. Unmatched flatspot resistance. Smooth, anti-stick ride. High-rebound compound.

Smooth Surface – Smooth wheels have less surface friction than treaded wheels and are easier to slide.

Narrow Profile – The least amount of traction intended for advanced, technical skateboarding.

Formula Four Urethane – Unmatched abrasion resistance (no flat spots), more controllable grip, lasting speed everywhere, smooth anti-stick slide, longer lasting (holds size and shape longer).

Classic Slim Shape – A slimmer, lighter version of the Classic Shape. Designed for lasting speed and a more comfortable slide.