The bike bearing headset is composed of quality aluminium alloy material,showing stability and durability.High-end performance and upgradability at an even more affordable price,the original can match your well and provide good bike performance.The seal circle is helpful for keeping away from water and dust,making a good effect to keep longer. Features: 1.HIGH QUALITY MATERIAL:The headset is composed of quality aluminium alloy material,delivering excellent stability and durability. 2.SUITABLE:The bearing headset is suitable for 44mm bike frame head tube with low friction face-seals on the crown races. 3.ELEGANT APPEARANCE:The headset with sleek surface and smooth rotation, matching well with your bike headset,the fashionable design will draw much attention. 4.HIGH QUALITY BATTERY:The sealing ring is good for keeping dust and water away to prolong servuce life. 5.GUARANTEE. If you are not satisfied with our product you received, you can send emails to us at any time. We will reply you instantly and help you solve your problem. Specification: Material: Aluminium Alloy Color: Shown as picture Group Height: 7.3 + 13 = 20.3mm Weight: Approx. 135g Suitable for most mountain bikes and part of road bikes with tube inner diameter of 44mm Package List: 1 x Bike Headset Set