1. Material: aluminum alloy cap + engineering plastic expansion body + hexagonal screws 2. Applicable models: most of the market mountain bike, road bike, folding bike 3. Technology: laser 4. Lightweight design, easy to ride without burden 5. Simple installation, easy to use 6. The cover is made of aluminum alloy, wear-resistant and durable 7. Inside diameter: 24-35mm 8. Weight: 20.8g/pair
