Material: Aluminum Design and Style: Standard 0.00 specification, not requiring cylinder expansion Cylinder Bore: 84.00mm Ring Thickness: 1st ring 1.2mm, 2nd ring 1.5mm, 3rd ring 2.0mm Compatibility: N55B30/N55B30A 3.0L L6 (2979cc) Twin turbo engines This 6-piece piston ring set is designed for performance and in output engine applications.Constructed from aluminum, the rings support efficient engine under conditions.The standard 0.00 specification allows for precise fitment without the need for cylinder boring, consistent performance and sealing.The set is compatible with multiple vehicle platforms including F20, F21, F30, F10, X3, X4, X5, X6, E82, and E88 models equipped with the N55B30 or N55B30A 3.0L inline-six twin turbo engine.Each ring is engineered to match the bore size of 84.00mm, with graduated thickness across the three rings to optimize compression and reduce oil consumption.Designed to meet OEM specifications, this piston ring set supports compliance with emission standards while maintaining engine efficiency.The materials are rated to withstand operating temperatures up to 105℃, stability and performance under elevated thermal loads.