Plastic:
Some companies take a tube of plastic that is formed very much like a feather nib. These are very effective and SOferim do not need to constantly sharpen the tip.
Some other writing utensils use different ways of ink flow. Some mimic the flow of a fountain pen making it extremely easy to write.
I think that is all I have about the Sofer's writing utensil, next time with the parchment or klaf!
