Korea metro token pre-paid ticket project

Korean city metro token is produced by our company,quantity reach 500 thousands pieces per year, the metro token is different from the conventional coin tag , it's round edge technology, smooth edges without burrs, strict requirements on the thickness of production,should keep every pieces around 0.18MM thickness,high printing process requirement, and customized chip requirement, high quality control.We have been coocperated for more than 3 years.