Ideal for rough conditions, Elite"s Sior Mio Race Water Bottle Cage uses an adjustable spring retention system so bottles are secure without being difficult to access. To accomplish this, the Sior Mio uses an advanced elastic structural element in the cage to allow a high range of expansion -- aiding bottle insertion/removal. Its shape is also designed to assist with bottle removal and installation with a larger than standard entry angle. The Elite Sior Mio Race Water Bottle Cage is constructed from fiber-reinforced polyamide so the the cage is light and durable. It comes in Six colors; Gloss White Ii, Gloss White I, Gloss Black Iii, Gloss Black Ii, Gloss Red, and Gloss Black I.