6x Piston Rings Set STD for 335i 535i X6 Z4 E60 E71 E90 N54B30A 3.0 Turbo 11257577586 This piston ring set is designed for use with specific engine models and provides a standard size fit for compatible applications.The set includes six piston rings, intended to support proper compression and engine performance.Each ring is manufactured to meet specifications for dimensional accuracy and material composition.This product is suitable for engine rebuilds or replacements where standard tolerance components are required. This replacement part is manufactured independently.All brand references are used solely to denote compatibility with listed models.