original package Weight of front hub:164g,weight of back hub:304g Weight of front quick release:42g,weight of back quick release:48gWeight of the set: 558gSize:width of front hub:100mm,width of back hub:135mm4 bearing32 holesMaterial:High rigidity aluminum alloy 7075 shaft CNC, Taki 2014 aluminum alloy, aluminum quick release handle 7075 plus Ni-Co-Mo nickel-chromium alloy hollow shafts