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.Pit Stop USA offers Comp Cams 10° Titanium Double Super Lock Valve Spring Retainers - Double Spring 1.500-1.550" - .730"-1.135" - (Set of 16) 729-16 at low everyday prices. Be sure to check out all of our products from Comp Cams including Comp Cams 10 Degree Titanium Valve Spring Retainers.