SFM Bighead Shape – The wheel shape that started it all. Slightly increased riding surface for all terrains.
99d Durometer – More speed and control on all surfaces. Unmatched flatspot resistance. Smooth, anti-stick ride. High-rebound compound.
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).
Medium Profile – Your classic wheel shape, versatile all-around wheel for street/park skating.