The Spitfire Formula Four Fireball Conical 99A have the following specifications:

Formula Four
- Unmatched abrasion resistance equals fewer flat spots
- Smooth anti-stick slide
- More controllable grip
- Lasting speed

Conical shape

Dimensions:
- Size: 52 or 54 mm
- Hardness: 99 Duro

OPTION

Add a set of bearings + spacers with free fitting