All DP retainers are made in-house at our factory premisses using the latest CNC machines to insure quality and batch to batch consistency. All of them are CAD designed and FEA analysed for accurate weight reduction and ensuring high rigidity. Retainers are made using 2 different materials according to engine needs and application. First and most common material is chromoly steel nitrided for added wear resistance and in addition there is always the choice of titanium retainers. A typical DP titanium retainer weighs about 50% less than it's stock steel counterpart.