Brand: ZOOM
Color: Full Black/Black+Red
Silver+Red/Black+Silver
Material: 6061 Aluminium Alloy+Stainless steel
Diameter:27.2/31.6mm (original)
28.6/30.0/30.4/30.8/33.9mm (adapted from 27.2 with a spacer)
Length of seatpost: 350mm
Travel: 40mm(27.2mm),50mm(31.6mm)
Weight: 455g(27.2mm),571g(31.6mm)
Spring Suspension, adjustable.
You can adjust the strength a little by adjust the bolt at the end of the seatpost.