On The Run OTR .084 Jumbo Ink Flowpen Graffiti Art Marker (Black) Flowpen jumbo marker with Black Ink REFILLABLE with OTR.484 200ml Flowpen ink refill. Pump action valve system for controlled ink flow Great for street art, calligraphy, posters, graffiti art, handstyles, scripts, and all forms of typography Waterproof on almost every material.