This is a Minoura SBH-300 rear water bottle cage mount with a Profile Design CO2 mounting bracket. It's in excellent like new condition with some light discoloration on the back of the saddle mounting area. - Behind-saddle mounted holder for two extra water bottle cages, or one bottle and one spare tube set - Good position for aerodynamics - Bottle cage mounting screws included - Not compatible with I-Beam type saddle. Standard dual rail type only Bid on Gear Goat auctions with confidence: eBayer since 1999, 8000+ transactions, 100% positive feedback. For convenience we accept many forms of payment and will professionally box, insure, and ship this item for FREE . Local pickup @ Gear Goat Xchg in Charlotte, NC always a welcome option! (c2)