ZOOM Seat-post Suspension for MTB or Road Bike 
27.2/28.6/30.4/31.6/33.9 * 350mm 
Brand:ZOOM 
size: Original size:27.2/31.6 
Other sizes required shim adapter ADD ON :28.6/30.0/30.4/30.8/31.6/31.8/33.9 
Material: Aluminum alloy 
Weight: Average x 475g (27.2x350mm) 
Average x 570g (31.6x 350mm)