k carbon fiber roll wrapped tube, the technology is roll-wrapped, so it's more durable than pultrusion. Surface finish, we can provide natural, 3k weave, glossy, matte, etc. Diameter, 500mm below, but it can be customized according to the order. About the length, we also can manufacture it according to your request. And it can be used for sports, aircraft, etc. If you have any doubts, you can contact us at all times.