Wiséco Forged Piston:

The Wiséco forged piston (high-quality steel) is fitted as standard by a large number of brands.
The manufacturing and anti-friction treatment of the Wiséco forged piston give it a longer lifespan, better engine response, and reduce the risk of seizure.
The Wiséco forged piston is an essential part for the maintenance and repair of off-road motorcycles.
Piston with oversize +1.10 mm
Replacement segment ref WI0001
The piston kit consists of:

• 1 piston diameter (67.50 mm)
  
• 1 piston pin
• 1 set of rings
• 2 circlips

(Photo non-contractual)