Each set comes complete with all retainers for your engine.

Skunk2 Racing Alpha Series titanium retainers are designed to significantly reduce valvetrain mass, resulting in more horsepower and improved valvetrain stability. Like the Skunk2's Pro Series Titanium Retainers, Alpha Titanium Retainers feature radius-cut edges for additional rocker arm clearance and reduced weight, strategically positioned lightening grooves, and reduced overall heights for better valve seal clearance and even further weight reduction. Skunk2 Racing retainers are machined to extremely close tolerances and inspected using strict quality control standards to ensure superior quality and maximum performance gains. All Skunk2 titanium retainers are manufactured using the latest 3D CAD (Computer Aided Design) and FEA (Finite Element Analysis) to ensure that each is optimized for strength as well as for reduced weight.