Don't think that zipper is a gadget can not pay attention to, its purchase should also be taken seriously, as a zipper manufacturer is necessary for everyone to point a few times, I hope you can seriously as a reference.
Since zippers have different adaptability to different environments, it is preferred to specify which type of product the zipper is specifically intended for, and there are no other special requirements. For example, for zipper ingredient requirements, this can be checked by the inspection tool to know.
Generally the zipper will indicate its number, the larger the number the zipper is also thicker, indicating the width of the zipper closed. Some of the number is particularly large belongs to the special zipper, the application is also relatively small. And for the zipper on the pants have a special logo to represent, because it is different from other zippers, especially the zipper head. With different identities, it's much easier to tell.