Ournylon coil closed end bag zippers come in coil sizes: #3, #4.5, #5 & 7. Nylon coil is a great choice for the bag maker, because you can sew directly over the zipper coil with your home sewing machine. Also, you can easily trim the zipper down to suit your needs, by simply cutting it with scissors.
The #3 zippers are best suited for internal zipper pockets, as the coil is smaller and more fine. While these will work well for bag openings too, a #4.5, #5, or #7 zipper has larger zipper coil and is much more durable and sturdy for a bag opening or pocket.
These are chosen specifically to provide you a collection of quality zippers with a selection of various zipper pulls to choose from.