The ornamental design for a cassette for electric wiremarker strips, as shown and described.
FIG. 1 is a front, top and left side perspective view of a cassette for
electric wire marker strips showing my new design, the cassette being in
closed condition;
FIG. 2 is a top, rear and right side perspective view thereof;
FIG. 3 is a front, top and left side perspective view thereof, with a
pivotable cover in upwardly oblique raised position; and,