Shigeru Ban has designed a unique retractable roller ball point pen for Acme Studio. In this digital world, computer generated images have become the norm, however, drawing is still an essential skill in the life of a designer, including architect. The triangular shape feels comfortable inside your hand, aside from being a working pen with highest quality, it also functions as a fully functional architect’s scale including metric and imperial measures, a nice pen for architects and engineers worldwide. This pen is made from aluminum and the measurements are laser etched into the surface. You can simply twist it to extend or retract it. Each pen comes in a custom triangular box.