Slider for zip fastener with interchangeable pull-tab

Slider for a zip fastener, comprising a base and a back part which are integral with each other and between which the rows of teeth of the said fastener are arranged, as well as an engaging member projecting upwards from the said back part and able to be constrained to the connecting ring of a pull-tab, the said engaging member being shaped substantially in the manner of a U having a first side of the two parallel sides fixed to the said base and the second side facing in a parallel manner the back part and terminating in a hook-shaped portion which is bent inwards, wherein at least the third side of the U which connects said sides perpendicularly is flexurally resilient thereby making said hook-shaped portion movable from a closing position, which constrains said ring of the pull-tab inside said engaging member, and a position wherein said hook-shaped portion is separated from said back part by a distance sufficient to create a gap for introduction or extraction of said ring of the pull-tab.