The tried-and-true Bottle Cage Formed using 6mm, hollow 6061-T6 aluminum tubing, this lightweight and economical bottle cage has a durable powder coat finish designed to keep it looking good. Details 6061-T6 aluminum rod with two-piece bracket Durable powder coat finish Special design fits over front derailleur bands Hollow tubing eliminates 15g without loss of strength Specs Material Hollow-Tube Aluminum Weight 58g