Ciro the bottle holder is mainly made of carbon and its shape offers the maximum grip of the bottle despite the minimalist design, so as not to protrude from the bike. Great attachment the black casing is reinforced by carbon to create an optimized shape and hold the bottle perfectly in place. The lightweight blend of materials (carbon casing and fiberglass core) is optimized for maximum lightness. 29g weight understated design all the excess material has been minimized to preserve only a sober shape. Due to the minimalist design, the ciro bottle holder is very slim and fits any bike. Great hookeggerominimalista