Introducing the new Formula Four - 93 Duro - Soft Sliders. 
The most controllable and consistent sliding soft wheel out. 
Soft Duro combined w/ High Rebound compound absorbs more impact & vibrations - easier on your body for longer sessions. 
Holds speed through even the roughest terrain. 
Reliable grip when you need it. 
  Unmatched Formula Four flatspot resistance. 
 
 
 
 
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