These Hellfireshock pistons are precision machined from aerospace POM (polyoxymethylene), providing pistons that are harder than normal nylon. This provides for more precise internal shock movement and less friction for smoother suspension movement. The 1.4mmX2 hole size is recommended for the rear shocks of the Hellfire.

POM (polyoxymethylene) is an advanced, aerospace polymer material that is extremely durable, lightweight and strong, providing the perfect mix of characteristics that make it ideal for racing applications! Color: Black See page 25 in Hellfire Instruction Manual.