This 6-piece piston rings kit is designed for vehicles equipped with N55B30 and N55B30A 3.0L L6 twin-turbo engines.The kit includes six complete piston ring sets suitable for engine rebuilds or maintenance.Each set is manufactured to standard specifications with an 84mm cylinder bore, precise fitment without requiring cylinder boring.The first compression ring measures 1.2mm in thickness, the second ring is 1.5mm, and the oil control ring is 2.0mm, supporting effective sealing, heat transfer, and oil control during engine.Components are made from materials engineered to withstand operating temperatures and mechanical stress.This kit is compatible with vehicle models produced between 2010 and 2017, including F21, F30, F10, X3, X4, X5, and X6 platforms.Installation follows standard procedures and requires common engine assembly tools.