Cap for writing instrument
FIG. 1 is a front elevational view of a cap for writing instrument showing my new design, the rear elevational view being a mirror image thereof; 
     FIG. 2 is a right side elevational view thereof, the left side view being a mirror image thereof; 
     FIG. 3 is a top plan view thereof; and, 
     FIG. 4 is a bottom plan view thereof.