Description/Features: 1. The material is made of carbon fiber, which is sturdy and durable 2. Carbon fiber products are more 3. Perfect for pairing with bicycles 4. Strive to make your cycling more convenient Specifications: size: Diameter 7.4cm Material: carbon fiber colour: black Package Contents: 1 x bike water bottle holder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 2. Carbon fiber products are more Description/Features: 1. The material is made of carbon fiber, which is sturdy and 4. Strive to make your cycling more convenient 3. Perfect for pairing with bicycles