Serpent Centax-3 one piece pinions
New for the Serpent Centax 3 clutch are these one-piece 2-speed pinions. Made from steel, instead of the standard coated aluminium, they are much stronger than the previous versions as well as more durable, having a better resistance to wear from grit and sand picked up on the track. The 2 pinions are now combined in one piece of metal, instead of 2 separate gears that are screwed together, and this now simply screws to the clutch bell for a very secure and true clutch assembly.
Source: Serpent [serpent.com]