Harley Davidson FXD Dyna 1991-2015 Mupo Suspension ST03 Twin Shock Absorbers NewREF#ST03HDN005 ST03 Twin shock absorbers pressurized gas (Nitrogen). The ST3 improves the control and comfort of the motorbike in all driving conditions. Thanks to the rebound adjustment, spring preload, and length, everyone can achieve the correct setting. The photographs are purely for information. Technical features: Body shock in steel Piston in Ergal 35mm DU bushing CNC parts machined Steel piston rod 14mm Rebuildable Adjustment: Spring preload