FIG. 1 is a front and top perspective view of a mouse pen, showing our new design;
FIG. 2 is a rear and bottom perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is a perspective view thereof, showing the mouse pen connected with a base; and,
FIG. 10 is an enlarged view of a portion indicated in FIG.1.
The dashed broken lines in the figures illustrate portions of the mouse pen, that form no part of the claimed design. The dash, dot dash lines in FIGS. 1 and 10 are for the purpose of depicting the cut line of the enlarged view and form no part of the claim.