This 4-piece piston and ring set features an 82.0mm bore diameter and is designed for use in M271 1.8L supercharged (1796cc) Kompressor engines found in W203, W204, A209, and C200K models.The pistons are made from cast aluminum, and the ring pack includes a 1.2mm ring, 1.5mm second ring, and 2.5mm oil control ring to support compression sealing and reduced friction.This configuration helps maintain consistent engine performance and manage oil consumption.The set is intended as a direct replacement for OEM parts 2710302217, 2710300024, 2710306617, and N000000000936 in standard engine rebuild applications.