Material ：Aluminium (6061、7075）
Machine process: It`s totally produced by CNC.
Surface finish ：Anodic treatment、ED Black、 Baking finish、Polish
Use: BMX, folding bicycle and general bike.
Specification : External diameter、Internal diameter
＊ We provide customization.
＊ The color of the process treatment depends on customer`s need, and welcome to call us.
