A connector marker for identifying an electrical conductor includes a marker body formed of a synthetic plastic material and a pair of generally planar half sections normally arranged in an initial open condition in horizontal coplanar side-by-side relation. At least one of the half sections has an upper surface carrying labeling indicia. At least one integral film hinge device connects the adjacent side edges of the half sections, thereby to afford pivotal displacement of the half sections about a given pivot axis from the open condition toward a closed condition enclosing the electrical conductor to be marked. At least one non-skid element extends from the hinge device for non-skid engagement with the outer peripheral surface of the conductor as the half sections are pivotally displaced from the open condition to the closed condition, thereby to prevent longitudinal slipping of the marker body relative to the conductor.