Speedball Art Products Company, Steel Brush
These poster pens for large lettering are made of 7 layers of thin and flexible steel-plates. A sufficient amount of ink is held in the spaces between the steel-plates. After using your steel brush, rinse immediately under water, scrubbing gently with an old tooth brush. The steel plates are non-corroding.

E 1/4, 7mm
E 1/4, 7mm