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Zipper's
 
A zip fastener are define by basic standard such as:- 
 

(a) Closed end

The length of a closed end zip fastener is measured from the end of the slider to the bottom of the bottom stop when the zip is fully closed.

(b) Open end

The length of an open end zip fastener is measured from the end of the slider to the bottom of the box when the zip is fully closed.

(c) Open end two way

The length of an open end two way zip fastener is measured from the end of the top slider to the end of the bottom slider when the zip is fully closed.

 
Types:
(a).
Plastic-molded zippers are identical to metallic zippers, except that the teeth are plastic instead of metal. Metal zippers can be painted to match the surrounding fabric; plastic zippers can be made in any color of plastic. Plastic zippers mostly use polyacetal resin though other resins are used too like polyethylene.
(b).
Metallic zippers are the classic zipper type, found mostly in jeans today. The teeth are not a coil, but are individual pieces of metal moulded into shape and set on the zipper tape at regular intervals. Metal zippers are made in brass, aluminum and nickel, according to the metal used for teeth making. All these zippers are basically made from flat wire. A special type of metal zipper is made from pre-formed wire, usually brass but sometimes other metals too. Only a few companies in the world have the technology. These type of pre-formed metal zippers are mainly used in high grade jeans wear, work wear, etc., where high strength is required and zippers need to withstand tough washing.
(c).
CFC zippers are basically used in all types of bags,luggage, school bags, purse, and ponches. Also used in huge varity of ladies and children garments.