This tassel comprises at least a first piece and a second piece, both independent, and attached to respective free ends of operating cords for blinds; and present on the facing surfaces are magnetically attracted first halves and second halves suitable for establishing a retention of tassel parts in a mounting position, to allow said parts of the tassel to separate when a force superior to the force of the magnetic attraction of said first and second halves is applied between the two cords; characterized in that the magnetically attracted first halves are mounted in a protruding position with respect to the surface of said first part.