1. Ultralight Full Carbon FiberCarbon bottle cages made of ultra-light, high strength, non-deformable, corrosion resistant carbon fiber material Full Carbon Fiber Material - Incredible strong and lightweight(only 20¡À1.5g),Effectively reduce the weight for long-distance travelers 2. Water bottle cage holder easy to install (2 bolts): installed on the bicycle frame in 1 minute (use a 4mm hex wrench (not included) Includes 2 bolts The bicycle frame requires threaded holes to install the bottle cage Designed to secure bottle hold and easy bottle removal 3. Suitable For BottlesThe bottle cage is around 2.91 inches (74mm) in diameter,suitable for 74mm diameter of bottles (maximum diameter),water bottle too big or too small may not fit firmly 4. Stay Hydrated On The RideQuick and easy access to your bike water bottle when you need it.Recommend buying 2 bottle cages to keep you hydrated on super long rides so you can go further!Great for road bikes,mountain bikes,hybrid bikes, touring bikes and e-bikes.