6pcs Pistons Rings Set with standard 0.00 specification for 84.00mm cylinder bore.Designed for use with N55B30 and N55B30A 3.0L L6 (2979cc) twin-turbo engines.Compatible with models including F20, F21, F30, F10, X3, X4, X5, X6, E82, and E88.Set includes three rings per piston with thicknesses of 1.2mm (first ring), 1.5mm (second ring), and 2.0mm (third ring).Constructed from aluminum material to support engine function under conditions.Does not require cylinder expansion during installation.Meets OEM specifications 11258619196, 11257610297, 11257610298, 11257589824, and 11257587914.Engineered to provide effective sealing, reduce oil consumption, and maintain engine efficiency.Suitable for applications requiring compliance with emission standards.Built to endure operating temperatures up to 105℃ without degradation.