One end of this Sharpie Twin Tip Permanent Marker is a fine tip similar to a standard Sharpie marker, ideal for clear marking on all kinds of surfaces. Flip the pen around and on the other end is an extra fine pen for handwriting and detail work. These pens use the same great Sharpie ink that is suitable for almost any surface, including plastic and metal. These black pens are fade and water-resistant and come in a pack of 12.