Sealed Power parts provide innovative designs, use leading-edge materials and utilize ISO & QS certified manufacturing in order to deliver top quality products that meet the rigorous demands of today's modern engines. Product Features:A-Series bi-metal aluminum alloyGreater seizure resistance than tri-metal materialOversizeAdditional oversize OD allows for cost effective reconditioningMeets or exceeds OEM specificationsMade with silicon to provide greater surface hardness