Zefal pulse aluminium bottle cageconstructed from aluminium and technopolymer the pulse bottle cage fits all frames and types of bottle the construction allows the cage to be rigid with flexibility in the areas that need it most the design allows a good hand bottle grip and technopolymer absorbs shock features aluminium provides rigidity and technopolymer absorbs shock fits all frames and types of bottles design allows you to grip the bottle easily materials aluminium and technopolymer wei