4pcs Pistons & Rings Set with a cylinder bore of 82mm designed for 1.8L M271 engines.Constructed from aluminum, this set is intended as a replacement for worn pistons and is compatible with various models including W203, W204, A209, and C200K.The set features STD 0.00 specifications and does not require cylinder expansion, dimensional accuracy for engine fitment.Each set includes four pistons and corresponding rings with ring thicknesses of 1.2mm, 1.5mm, and 2.5mm to support sealing and engine. This item is a third-party substitute.Use of brand names is limited to indicating which devices it supports.