Elite SRL Rocko Carbon Water Bottle Cage: Matte Black/White. Elite Rocko Carbon is an ultra-light and resistant injection carbon fiber bottle cage with high retention capabilities the ideal instrument to perfectly manage the bottle especially on a mountain bike and under extreme training or competition conditions such as rocky downhills and freerides.Very resistant and practical Rocko Carbons greatest strength and distinctive feature is its front and side insertion. This makes it compatible with all frames and especially on bicycles with smaller or sloping frames.