The Xlab Gorilla-Carbon Cage helps prevent bottles ejecting from cages on bumpy roads, mountain bikes and saddle-mounted water bottle carriers. The Xlab Gorilla-Carbon Cage has over 2X the gripping force of conventional carbon cages due to the 6 high shouldered carbon gripping fingers, tall retention tab at the top and thicker carbon. The Xlab Gorilla-Carbon Cage will fit on any standard cage mounts. Get the grip of Gorilla. Weight: 38g