30" Light Weight Jacket Zipper ~ YKK #5 Nylon Coil Separating Zippers - 519 Hot Red (Pack of 1 Zipper) 30" Light Weight Jacket Zipper YKK #5 Nylon Coil Separating Zippers 519 Hot Red (Pack of 1 Zipper) The slider runs on two coils on each side; the "teeth" are the coils. YKK's perfect zipper for light weight outerwear jackets.