Dual head Design: Dual head design for closing and separating in both directions, making it more convenient for you. In addition, Our zippers are waterproof designed to protect your stuff even if it gets splashed with water Package Includes: 6 pcs black doule slider zippers, 83cm/32.7 inch long, its tooth is 77.8cm/30.6 inch long, 3.1cm/1.2 inch wide, you can use the whole strip or cut it as you like Durable Material: The zipper tape is made of quality nylon, which is more pliable, wear-resistant and durable. And our zipper puller is made of alloy, which is stronger and tougher Easy to Use: Our zippers are not only lightweight and don't add excess weight, but also so smooth that every pull is easy. It's exactly what you need Wide Application: It can be used to replace old zippers on backpacks, jackets, covers, pillows, suitcases, etc. It can also be sewn onto handmade fabric items such as canvas bags and dolls