Zipperstop Wholesale YKK&reg; 27" Light Weight Jacket Zipper YKK #5 Nylon Coil Separating End Color 560 Navy (1 Zipper/pack) Zipperstop Wholesale YKK 27" Light Weight Jacket Zipper YKK #5 Nylon Coil Separating End Color 560 Navy (1 Zipper/pack) The slider runs on two coils on each side; the "teeth" are the coils. These zippers are thoroughly tested for strength and durability.