The coating is transparent, giving it a luxurious look due to the beauty of stainless steel. Flat line type. Commonly made of iron. The coiled wire of the outer cable is made from stainless steel. The coating is rust-resistant and has a transparent color for a luxurious look. Polyethylene inner liner is also included to make brake lever pull light You can easily dress it up and upgrade it. The outer diameter of the brake outer diameter is 5mm, and the inner wire can be used with 1.5mm or 1.6mm.