This piston rings set is designed for the N52 3.0L engine with a 10.7:1 compression ratio.It is compatible with vehicle models including E90, E60, E83, 128i, 328i, 528i, X1, X3, X5, Z4, and 730i.The set includes all necessary piston rings for a complete engine reconditioning or rebuild and is engineered to meet specifications for proper fit and performance.