Cursor (1) provided with two drag tabs (2, 3) arranged symmetrically with respect to each other and each provided with a ring (2a, 3a), the cursor comprising a hollow body (4) containing a locking mechanism (5), whose nail (6) is designed to be inserted between the teeth of the zip fastener in a reversible manner to prevent unwanted displacements between the zip fastener and said cursor (1), this locking mechanism (5) being provided with a elastic means (7) that keeps its nail (6) inserted between the teeth until it is separated by one or another of said two drag tabs (2, 3), which allows to move the cursor (1) with respect to said teeth , cursor (1) characterized in that one (2) of the pull tabs (2, 3) is directly in contact with said locking mechanism (5) through its ring (2a) so that, when it is actuated , produces said separation, and the other pull tab (3) is located with its ring (3a) in contact with an inclined plane (8) that is part of a rigid profiled element (9) contained in the hollow body (4), this inclined plane (8) being located so that the said drive drag tab (3) causes a rotation of the rigid element (9) sufficient to press it against one end (10i) of a movable pin (10) housed in the body (4) of the cursor (1), and to move it axially so that its other end (10s) pushes said locking mechanism (5), overcoming the resistance of said elastic means (7) and separating its nail from the teeth of the zipper.
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