The YKK Group is a Japanese group of manufacturing companies. As the world's largest zipper manufacturer, YKK Group is most known for making zippers; however, it also manufactures other fastening products, architectural products, plastic hardware and industrial machinery.
The initials YKK stand for Yoshida Kōgyō Kabushiki gaisha "Yoshida Manufacturing Corporation"), which was the name of the company from 1945 until 1994. YKK produces fasteners and architectural products at 109 YKK facilities in 71 countries worldwide.
Fastening products are the first and still the most important product of YKK. Within YKK, the company distinguishes between the Slide Fastener Division, the Textile and Plastic Products Division, and the Snap Fastener and Button Division.
Standard Metal YZiP: Metal zipper, extra durable for jeans
EverBright: Metal zipper, polished for visual appeal, corrosion resistant
Excella: Metal zipper, polished and plated for visual appeal, also in different colours (silver, gold, and "antique" finish)
Standard Coil Conceal: Plastic coil zipper with concealed elements (no visible teeth)
Vislon: Standard – rugged plastic zipper
According to en.wikipedia