The basics This Sharpie Twin Tip Permanent Marker combines a fine and ultra fine marker in 1 handy pen.  The benefits The quick-drying ink is both fade and water resistant making it a great choice for both indoors and outdoors.  The uses This marker has non-toxic ink which makes it suitable for a number of environments, and it will mark on a wide range of surfaces. The bottom line The Twin Tip has a 0.3 mm nib on one end and a 1.0 mm nib on the other. The ink from both nibs is black.