The OTR laboratory developed a marker which really is a flowpen.
With some exercise you really let the ink “flow” through the tip, creating drips.
The OTR Calligraffiti marker was introduced as a limited special edition marker in 2010, to mark the release of Niels 'Shoe' Meulman's 'Calligraffiti' book (From Here To Fame Publishing).
It's now a permanent fixture of OTR's extensive bombing marker inventory
Specialised 20mm bevelled T-tip, with 3 distinct edges that can be used to create 3 different line widths
Designed for perfecting intricate hand-style effects
Flow control pump system
Permanent spirit based ink
For indoor/outdoor applications