Feature:1. Aluminum Alloy: Mountain bike bearing bowl set is made of high quality aluminum alloy material, rust resistance, durable2. Lighter Bowl Cover: Built in oil waterproof technology, the waterproof oil is placed on the edge of the headset upper bowl, making the whole headset integrated3. Easy to Use: Sealed double bearing bowl set, waterproof and maintenance free, strong and easy to use, flexible in rotation, silent infiltration4. High Performance: This mountain bike bearing bowl set adopts CNC process, anodized coloring, glazed surface, not easy to fade5. Application: Suitable for 44-55mm tapered head tube frame with 28.6mm standard straight tube front fork or 1.5in standard tapered tube front forkSpecification:Item Type: Road Bike Headset BearingsMaterial: Aluminum AlloyModel: DH-552Application: Suitable for 44-55mm tapered head tube frame with 28.6mm standard straight tube front fork or 1.5in standard tapered tube front fork Package List:1 x Bike Headset Top Caps4 x Bike Bearing Bowl Group1 x Bike Bearing Rings