Supertech FORGED std bore 81mm piston set made for the Audi and VW 1.8T engine. 9.3-1 cr. Set of 4 pistons with rings, wrist pins and circlips. Uses Tool Steel 20mm HD wrist pins for a perfect match to Our #105.100 H Beam Forged Connecting Rods. Made from high silicon enhanced 4032 alloy that has lower thermal expansion. Offset wrist pins for quieter operation. HD Tool steel wrist pins. Phosphate dry lubricant coating.