Description: - Material: This headset is made of highquality aluminum alloy, which has good stability, rust resistance and durability. - Fine workmanship: fine workmanship, no discoloration or deformation. - Design: Double bearing structure, waterproof . - Scope of application: This headset is suitable for 44/56mm frame head tube, compatible with the outer diameter of riser 28.6mm or 39. - Easy : install and use. It is replacement part for your .Specification: - Material:Aluminum Alloy - Color:BlackSize Chart:Front Tube Diameter:28.6mm/1.125inch39.1.57inchFrame Head Tube Diameter:44mm/1.73inch56mm/2.20inchPackage Includes:1 Piece&; HeadsetNote:1. Please allow slightly error due to manual measurement.2. Due to between different monitors, the picture may not reflect the actual the item.3 shopping!