●Standards: 1 piece #15 resin zipper zipper opener (opening at the end of the fastener), this is a large size fastener, so please be aware of it ●Zipper Type: Double-opening poplin type with 2 zipper heads that can be opened left or right up or down. Double zipper design allows it to be opened wide when sewn on objects to make it easier to insert and remove contents ●Material: Resin + Nylon (Uses a general purpose nylon that does not damage the fabric, making it lighter and softer than metal, so there is no need to worry about rust. (One piece molding than large injection molding machine, durable and long lasting) Environmental protection and washable ●Wide range of uses: DIY handmade, double open poplin type, so it can be used as sleeping bags, boats, canvas, tents, down jackets, coats, etc ●Service: All of our products are inspected by one by one, so please rest assured that if you have any defects or questions, please contact us freely, and we will respond quickly. 30 Days Return Guarantee