FIG. 1 is a front left perspective view of a pen showing our new design;

FIG. 2 is a rear right perspective view of the pen shown in FIG. 1 with the pen cap removed and placed on the opposite end of the pen;

FIG. 3 is a left side elevation view of the pen shown in FIG. 1;

FIG. 4 is an enlarged top plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is an enlarged bottom plan view thereof;

FIG. 8 is a rear elevation view thereof; and,

FIG. 9 is an exploded perspective view thereof.