Vertex Pro forged piston:

Vertex Pro forged pistons (high-quality steel) are fitted as standard to a large range of motorbike brands.
The manufacture and anti-friction treatment of forged Vertex Pro pistons offer a longer lifespan, better engine response and reduce the risk of seizure.
The Vertex Pro forged piston is an essential component for motocross bike maintenance and repairs.
High-compression piston
For prepared engines only
Replacement piston ring product no. 277400
The piston kit includes:

• 1 piston size B diameter (94.94 mm)
  
• 1 gudgeon pin
• 1 set of piston rings
• 2 circlips

(Actual product may differ from photo)