How to distinguish good hardware and zipper

Hardware is an important standard to judge, the general good hardware bright luster thick, no burr, especially the zipper, zipper pull up good manufacturers feel smooth, chewy and lubrication. General good manufacturers bag used imported glue, volatile acid less hardware will not change color quickly, genuine general hardware 1-2 years without obvious fading traces, super A bags if good hardware manufacturers generally can also be used for six months or longer.