VW Motorsport Forged Piston Set made by Wossner, 83.5mm Bore, 20mm Pin, Made from high silicon enhanced 4032 alloy that has lower thermal expansion. Offset wrist pins for quieter operation. Cold extruded chrome moly steel wrist pins. This set includes 4 pistons, rings, pins and clips. These were made for VW Motorsport. Only a few sets left.