Carbon bicycle frames,carbon bicycle parts, Racing frame.Mountain bicycles,road racing front fork,Handlebar,Seatpost Type: seatpost Model:GK-SP003 Material:Carbon weave: ... 6mm/30mm We are the original manufacturer of the carbon bicycle frame,Our factory Established on March 2007, specializes in ... PrinciplesQuality First, Client Focus, Elaborate Work, Constant Progress carbon bicycle parts, Seat post