Unbeatable lasting performance — Spitfire's Formula Four urethane is fast as hell, long lasting, and abrasion resistant, with a smooth anti-stick slide and controllable grip. Guaranteed. A wider version of the Conical shape. Wide riding surface with cut-in sidewalls to decrease weight. A solid, controllable shape for all terrains.

Specs:

• 53mm
• 99a durometer
• Formula Four urethane
• Conical Full shape