This 3-piece piston and ring set is designed for 118i vehicles equipped with the B38A15 or B38 1.5T engine.Constructed from forged aluminum pistons and steel rings, the set supports engine performance under normal operating conditions.The package includes three pistons, three rings, and one piston pin, providing a complete assembly for engine rebuilding or repair.It features a compression ratio of 11:1 to support efficient fuel combustion.Ring specifications include a 1.2mm first ring, 1.5mm second ring, and 2.0mm third ring, designed to withstand elevated temperatures and pressures.This set corresponds to OEM numbers 11258657760, 11258693017, and 11257561710.Compatible with select models including 116i, 118i, 216i Tourer, 218i Tourer, 218i, 220i, and 318i.Also fits certain , Cooper S, Cooper Works, Countryman, and Clubman variants with compatible engines.