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 carefully polishes each small part called an element. This polishing process results in very few irregularities on the entire zipper, providing a smooth, sleek feel to the touch and a slider that glides smoothly.