Manley Lightweight 10° Titanium Retainers are essential in squeezing more RPM's out of your engine. These lightweight retainers will help your valvetrain avoid valve float at high RPM's without sacrificing reliability. They weight in at only 16 grams compared to standard retainers which weight between 16 to 21 grams. They are constructed from a special heat treated titanium for maximum strength and durability. Requires 10° valve locks.