Optima Hair Fixed Handle Tip. This tip is used to make hair on your caricature or mammal carvings instead of using a tear-drop shaped dremel bit or micro-V hand gouge. Obviously you may still need these other tools for wider furrows but this pen will make short work of the medium to finer sized hairs on your carvings (up to 1mm wide). This tip is only available in heavy duty style as its design requires a thicker tip wire. It can also be used to do fine hair/feather work where you can adjust the width and depth of a line by just pressing harder (rather than increasing your heat settings). As this pen tip has a limited "choke point" in it it may tend to get more heat to the pen body.