OPUS 88 Koloro Fountain Pen - Blue/WhiteOPUS 88 Koloro Fountain pen. This pen is a wonderful mix of concepts and materials with the resin and ebonite alternating schemes combining with the traditional Japanese style eyedropper filling system. Filling and writing with this pen is like a modern day tea ceremony. This pen has a lovely warm feel. The pen is filled with the supplied eyedropper and uses a piston operated shut off valve to seal the barrel when travelling or flying. When writing