YKK #4.5 nylon coil non-separating, closed end zippers featuring a long pull makes them ideal for purses and bags. Features a non-lock, extra long slider and has a medium-weight #4.5. One-way zippers are standard non-separating zippers that only open in one direction. They have one zipper slider and are ideal for one-way closures and projects like handbags, purses, or totes.