The Diarge rollerball pen made of brass combines noble aesthetics with functional design. The first rollerball systems were developed in 1963 by the Japanese pen manufacturer Ohto. Ink conductors and ink were located in a closed housing that resembled a ballpoint pen refill. The pen works with the well-known Ohto refill, which enables easy, gliding writing. The ink flows from the high-quality gel refill over the ceramic ball onto the paper surface without interruption.