The ornamental design for a mop head, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a top-front-right perspective view of a mop head showing my new design;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a left view thereof; and,
FIG. 7 is a right view thereof.
The broken lines in the drawings illustrate portions of the mop head which form no part of the claimed design.