3SGWV3 (Black Silver Double Type) MR Reverse Opening (Double Opening) 54cm Zipper Size: 3 Color: #071 (Dark Navy) 5 pieces YKK's premium zipper "EXCELLA" Unlike other metal zippers, EXCELLA meticulously polishes each small part called an element. This polishing process minimizes the unevenness of the entire zipper, resulting in a smooth, sleek feel to the touch and a slider that glides smoothly. 14