This topeak shuttle cage is a tubular alloy bottle cage designed for both road and off road use the bottle cage is made with a strong 6061 t6 aluminium construction and uses an aluminium bracket to fasten to your bike not only is this water bottle cage strong it is extremely lightweight weighing only 42g topeak shuttle al bottle cage features strong 6061 t6 aluminium construction with 6061 t6 aluminium bracket lightweight with durable powder coat finish 42g available in bl