4pcs Pistons and Rings Set with a cylinder bore of 82mm designed for 1.8L M271 engines.This set is compatible with models including W203, W204, A209, and C200K.Constructed from aluminum, the pistons are engineered for performance and .The design dimensional accuracy with STD 0.00 specifications, avoiding cylinder expansion issues.Each set includes four pistons and corresponding rings in thicknesses of 1.2mm, 1.5mm, and 2.5mm to provide proper sealing and engine function.The components are tailored to fit the M271 1.8 Supercharged 1796cc Kompressor engine, supporting and restoration of engine performance. Disclaimer: This is a compatible replacement part.Any brand or model mentioned is for compatibility demonstration, not endorsement.