On The Run OTR Street Polisher Set - Black Ink Street Art Mop Dauber Drip Marker Street Polisher mop style squeezer marker set of 2 OTR 7784 and OTR 7484 versions included Filled with super permanent alcohol-based high quality black Flowpen ink and are refillable Both markers come with a round sponge tip (20mm and 25mm) great for posters, signage, scripts, typography, and any professional artistic application.