Abstract: A stop of a zipper is mounted at an end of the zipper, is L-shaped and has a mounting protrusion and a limiting protrusion formed transversely on a proximal end of the mounting protrusion. When the mounting protrusion of the stop is mounted into a slider, the limiting protrusion and the slanted upper surface of the limiting protrusion prevent the slider from further sliding into a channel of the slider so the slider stops actually. Moreover, corners and edges of the stop may be all rounded so the stop is able to smoothly slide into the slider.