Spitfire Duro 99 – The Duro 99 by Spitfire has more speed and control on all surfaces, has flat spot resistance, long-lasting anti-stick slide and a higher rebound compound.

Radial Shape – Round edges, slim to medium riding surface offers a quick, responsive , round edge shape.

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).