The Metafis Pen series uses brass to intentionally give the body a moderate weight, assisting with the pressure needed to press the pen against the paper. Additionally, the world's thinnest 2mm diameter eraser allows for smooth correction of fine details. There is a crack on the surface of a few millimeters, as shown in the third photo. It is unused, and there are no other scratches or stains besides the crack. Both ballpoint pens and mechanical pencils can be used.