N52 3.0L engine piston rings set with a compression ratio of 10.7:1.Designed for use in models compatible with OE/OEM numbers 11257536373, 11257561848, and 11257547838.Includes 6 pieces per set.This piston ring set fits various vehicle applications including E90, E60, E83, 128i, 328i, 528i, X1, X3, X5, Z4, and 730i.Installation guidance is not included.Professional installation is advised.For accurate fitment verification, it is recommended to provide the vehicle identification number prior to purchase.The product is neutral packaged without branding or logos.