The invisible zipper has been vastly used for more than 30 years.
However, the open-end zipper has never been produced and used due to its unique stitching method different from the flat stitching for normal zippers. Until 1999,
KCC successfully developed and applied a movable box on the invisible open-end zipper, which has been patented in many countries all over the world and able to formally produce and use in the market.

The box of invisible open-end zipper can be moved together with slider to let the inserted pin to be sewn completely.
After sewing, then push box back to the end then reposition to combine pin perfectly.