Ultra-light and strong material: 3K carbon fiber - very strong and light (only 23 2 grams) - no deformation and corrosion resistant. Effectively reduce the burden of long-distance travelers. Advantages: The retention keeps the bottle in place when riding on rough terrain. Easy to install and remove. The unique slim design allows you to easily access your water bottle while riding, making it easier and more convenient for you to hold the water bottle. FITS MOST STANDARD SIZE WATER BOTTLES: The carbon fiber water bottle cage measures approximately 3.5 inches in diameter and fits water bottles ranging from 3.5 to 3.5 inches in diameter. Suitable for most types of bikes, such as mountain bikes, road bikes, and folding bikes. Perfect for any rider looking for a stylish cage to lighten their ride.