N52 3.0 engine piston 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 components identified by part numbers 11257536373, 11257561848, and 11257547838.The piston rings are engineered to maintain proper cylinder pressure and oil control within the engine system.Installation requires standard mechanical tools and adherence to standard engine rebuild procedures.