N52 3.0 engine pistons rings set with a compression ratio of 10.7:1, designed for use in models including E90, E60, E83, 128i, 328i, 528i, X1, X3, X5, Z4, and 730i.This set includes piston rings with part numbers 11257536373, 11257561848, and 11257547838.The components are engineered for precise fitment and performance in N52 3.0L engine applications. This replacement is made by an independent supplier.All brand references are used solely to indicate compatibility.