When you upgrade from steel to titanium valve spring retainers you gain speed and power, because COMP Cams? titanium retainers are lighter and stronger than steel. Additionally, our Super Lock? titanium design gives you confidence; no longer will you be preoccupied with splitting a retainer and tearing up an engine when turning 10,000 rpm. COMP Cams? titanium retainers are American made from the finest 6AL4V alloy for maximum stiffness and minimal warpage. The 6AL4V alloy is heat-treated and processed to a stringent tolerance; it has to be since it is used on the U.S. Air Force F-117 Stealth Fighter. Other manufacturers purchase titanium from metal brokers and produce ?cheap? retainers, but COMP Cams? titanium retainers will not deform. From a standing idle to the most extreme rpm, our titanium retainers perform flawlessly, without compromise.