ZOOM Suspension Seatpost Shock Absorber damping Alu MTB road bike Bicycle Seat post 27.2/28.6/30.4/30.8-30.9/31.6mm X350mm

Seat tube parameters:
Material: Forged Alloy/alloy
Cradle: 55*32mm
Diameter: 27.2mm/31.6mm
Length: 350mm
Travel: 45mm
Weight: 504g(27.2*350mm) / 575g(31.6*350mm)
Seat post bushing parameters:
aperture: 28.6mm/30.4mm/30.8mm
Length: 60mm
Weight: 8g (28.6mm) / 21g (30.4mm) / 25g ( 30.8mm)

Bottom screw to adjust spring damping force