Hello there, CARBONFAN is a carbon bicycle parts manufacturer based on China since 2008. Sorry for being late to join the party. We will try to answer your questions as openly as possible. If you need warranty support, and if you have an OEM inquiries or other important private messages, don't hesitate to contact us directly. We grew up together with our customers and it's been very exciting to be a part of the cycling industry. Your trust allows us to continually develop our product line and technology improvement. Many thanks to those who have been working with us over the years!