Forged Vertex Pro Piston:

The forged Vertex Pro piston (high-quality steel) is originally fitted by a large number of brands.
The manufacturing and anti-friction treatment of the forged Vertex Pro piston gives it a longer lifespan, better engine response, and reduces the risk of seizing.
The forged Vertex Pro piston is an essential part for the maintenance and repair of off-road motorcycles.
Piston without rear window, to favour low revs
Domed head piston
Replacement segment ref 264140
The piston kit consists of:

• 1 piston size B diameter (53.93 mm)
  
• 1 piston pin
• 1 set of segments
• 2 circlips

(Non-contractual photo)