Anjoy Ultra Light Full Carbon Fiber Bicycle Bike Water Bottle Cage Holder for Road Bike MTB (2pcs)

100% FULL Carbon Fiber Material - Incredibly strong and lightweight (approx. 30g), non-deformable, and corrosion-resistant. This carbon cage holds the bottle steadily, even on bumpy gravel rides. For expected bumpier rides, we suggest using some straps to secure the bottles depending on your preferred size of the bottle.  The upper part of the bottle holder has a protruding design to help hold the bottle firmly The design of the bolt holes is also excellent. It has enough room for a larger headed hex screw and is recessed enough so the screw head doesn't mangle your bottle