The Bontrager Hollow Bottle Cage is the tried-and-true cage formed using 6mm, hollow 6061-T6 aluminium tubing. This lightweight and economical cage has a durable powder coat finish designed to keep it looking good.Bontrager Hollow Bottle Cage Features6061-T6 aluminium rod with two-piece bracketDurable powder coat finishA special design fits over the front derailleur bandsHollow tubing eliminates 15g without loss of strengthMaterial: AluminiumWeight: 58g More info