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Material: the bicycle headset is made of high-strength aluminium alloy and has a long service life. [Careful workmanship] Use dozens of processes such as polishing and polishing to create a delicate metal feel Flexible rotation: closed bearing, the rotation is very flexible Waterproof: built-in oil seal, waterproof design, tight combination without marks [GUARANTEE] If you are not satisfied with the products received from us, you can request an unconditional return and refund within 180 days. You can send us an email at any time with questions about this product. We will get back to you as soon as possible.