Water bottle holders - these usually mount to the frame using two allen bolts
Black lightweight aluminium bottle cage from Topeak Weighs in at just 49g / 1.72 Oz
Silver lightweight aluminium bottle cage from Topeak Weighs in at just 49g / 1.72 Oz (Note: Picture shows black)
Black lightweight engineering grade plastic water bottle cage from Topeak Weighs in at just 49g / 1.72 Oz