Comp Cams Titanium Retainers, 1.437In Dia MeterUpgrading to COMP Cams titanium valve spring retainers will often allow you to gain speed and power because titanium retainers are lighter and as stong as most steel ones. 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. User 1