This pen is neither square nor round. It is simply unique as all things which long for perfection. Wall Street is made of celluloid, the queen of materials, the tradition and innovation in writing instruments. The pen is highly symbolic not only in its shape, but also in its material which recalls the wall and the skyline of Manhattan by night, from which its name is inspired. 4000 total pieces worldwide. 18kt nib. Filling system: double reservoir