Madbomr Hobo Marker is extremely popular with street and freight artists for their monikers. Generally, Art Primo Madbomr Hobo markers are solidified paint stick markers which will write on the most amount of surfaces of any solid marker including rough, smooth and wet, metal, wood, glass and concrete. Madbomr Hobo markers are solidified paint stick markers which will write on most surfaces including rough and smooth surfaces.