Xlab products have been used to win 23 World Championships since 1993 this makes Xlab the worlds most winning hydration and storage system available. Standard frame-mounted bottles have high aerodynamic drag so place your bottle at the rear instead. The Delta Wings are mounted on the saddle rails for no measurable drag. Key Features Aerodynamic Location-Mounting to the saddle rails in the riders draft allows for clean aerodynamics and easy access. Great way to increase your speed. Stable Design-Strong sturdy mounting. The material used on the carrier is high strength and will not sway allowing for fast safe access to the bottle. Special Cage Design-The cage design is funnel shaped allowing for easy insertion of your bottle. High Gripping Cage-The cage grips the bottle with 5 or 7 lbs of tested force to prevent slippage. Anti-Vibration-Using Loctite and locknuts the screws are locked in place for safety and security. These systems are also ideal for longer training rides or Century rides where an extra bottle is necessary so you can have your favourite mix with you at all times. Includes 1 XLAB Cage Mount and 1 XLAB Gorilla Cage. Weight 98g manufactures claimed.