Y.K.K. Vislon separating zipper. Extremely strong and lightweight. Teeth are chemical and corrosion resistant Vislon nylon. Extends the use of Vislon beyond the conventional metal zipper. Tape is polyester. Zipper is self-lubricating to operate smoothly despite mud, sand and grime. Vislon has excellent heat resistance (up to 360°F.) and cold resistance (to -60°F). This has a metal pull. If you don't see the size you want, just get a larger one and cut it to the size you need. The #10 is often used in tents, sleeping bags, hockey bags, or any application where you see large zippers. Double pulls have pulls on both sides of the slider so you can open them from both the inside and outside.