Make no mistake about it, the OTR.084 (aka Flowpen) is a professional marker and can be used on pretty much any surface in existence. The OTR.084 is not called the Flowpen for nothing! This marker is hardcore on the drips. You have the control to make it as drippy as you like! The marker is totally transparent, so you can always know your exact ink level. You can refill your Flowpen with the special OTR ink (or really any ink of your choosing, providing that it is light enough to pass through the nibs) and replace your nibs, and to top it off your marker is guaranteed to work for years!
The OTR.084 is available at BombingScience.com for only $6.95!
And don’t forget to pick up a few replacement nibs, because believe me, you will be using this one the most. I’ve also seen the wide nibs somewhere before, keep an eye out for those. The replacement nib featured to the left is only $1.99/each at Bombing Science.com.