Boasting a lightweight carbon fiber composite the xlab carbon wing bicycle aero mounting system will allow you to store your mobile phone keys cash tyre levers and essential items whilst the single bottle cage will allow you to stay hydrated when youre on the go with no restrictive protrusion where the bottle enters the cage it secures your bottle using 4 x grip teeth between the two mounting screws with dual mounting holes for the saddle rail clamps it allows you to have the cage ver