The ornamental design for a massage implement head, as shown and described.
FIG. 1 is a front perspective view of a massage implement head showing my
new design, the broken line showing of handle being for illustrative
purposes only and forming no part of the claimed design;
FIG. 2 is a front elevational view thereof, the rear view being identical
thereto;
FIG. 3 is a left side elevational view thereof, the right side being
identical thereto.