1) It can be used in various occasions, but it is generally preferred to be used on the pocket of clothing. 2) This type of zipper is produced after the birth and invention of nylon zipper material. This type of material is mainly composed of paraformaldehyde and the cost is between nylon and metal zipper. This type of zipper is more durable than metal and The nylon zipper is good. There is also a plastic tooth zipper in Guangdong direction. 3) Commonly used sliders are painted, sometimes electroplated.