YKK zippers are the industry standard and highest quality in the market. Pre-made #10 Nylon Coil Open End Lock Zippers. Black finish and tape. These are autolock zippers, so the sliders stay put until the tab is lifted and slider is moved. 28" in length. Product contains  nylon and  PET (Polyethylene terephthalate - plastic). Heat resistance up to 130 C. Cold resistance down to -60 C. A larger and stronger chain, ideal for outdoor applications, such as sleeping bags, backpacks, etc. Moisture resistant. Larger,