FIG. 1 is a perspective view of a pen;
FIG. 2 is a left side elevational view, the right side being a mirror image thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a perspective view in an exploded condition; and,
FIG. 8 is a left side elevational view of FIG. 7, the right side being a mirror image thereof.