On the Run OTR .084 Calligraffiti Flowpen Permanent Calligraphy Ink Marker (Black) Limited edition Calligraffiti jumbo ink marker Great for street art, calligraphy, posters, graffiti art, and handstyles. Special custom calligraphy nib Refillable with the OTR .484 Flowpen Ink 200ml refill. Flowpen has a pump action valve that gives you control of the flow of ink