The Pilot Lettering Pen allows you to write beautiful calligraphy with nice line variation. Water-based pigment ink gives strong color and is quick-drying, water-resistant, and lightfast. Each pen has a lime green body and has the tip width displayed on the top of the cap. A unique trait of this pen cap is that it contains a system that keeps the ink in the pen tip circulating, even while it is capped. This way, the pen tip does not dry out when its not in use. The next time you write, the pen will deliver a smooth line from the very start.