FOUR DIFFERENT INK COLORS IN ONE PEN! MULTI-FUNCTIONAL DESIGN. PEN COLOR IS WHITE AND INCLUDES ALL 4 MEDIUM POINT INK COLORS, BLACK, BLUE, RED, AND GREEN. AT THE CLICK OF A COLOR CODED BUTTON, YOU SELECT THE COLOR YOU WANT. THE INK IS HIGH QUALITY, QUICK DRYING AND OFFERS SMOOTH WRITING. INCLUDES ATTACHED LANYARD WITH BREAK-AWAY FEATURE. COMPLIES WITH ASTM, CPSIA, PROP 65. 5 11/16" L X 5/8" DIAMETER