The Charger 3.1 RC2 Piston Upgrade Kit transforms an existing Charger 3 damper into the new Charger 3.1 damper. With its expanded damping range, the Charger 3.1 RC2 is perfectly suited to tackle any trail. With reduced compression damping in the low-speed range in the open position and additional support at the closed high-speed compression setting, you have all the traction, control, and comfort you need to ride all day on the most challenging lines.