FIG. 1 is a right side elevational view of a ballpoint pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear side elevational view thereof;

FIG. 4 is an exploded right side view thereof;

FIG. 5 is an exploded front view thereof;

FIG. 6 is a front view of the front portion of the clip, shown separately for ease of illustration;

FIG. 7 is a front view of the rear portion of the clip, shown separately for ease of illustration;

FIG. 8 is a top plan view of the ballpoint pen as shown in FIG. 1, and,

FIG. 9 is a bottom plan view thereof.

The broken lines are for the purpose of illustrating environmental matter and form no part of the claimed design.