Pen cap
FIG. 1 is a bottom, right rear perspective view of a pen cap showing my new design; 
     FIG. 2 is a left side elevational view, the right side being a mirror-image thereof; 
     FIG. 3 is a front elevational view; 
     FIG. 4 is a rear elevational view; 
     FIG. 5 is a bottom plan view; 
     FIG. 6 is a top plan view; and, 
     FIG. 7 is a left side elevational view with the outer wall shown partially broken away for convenience of illustration.