A cap is screw-type. This model has no trim and no distinction between cap and barrel. This model is piccolo and is supposed to be used without posting the cap when writing. As ebonite is a very light material it is possible to make the barrel thicker and longer. Therefore the balance point can be set easier to provide comfortable writing for everyone. Wajima urushi nuri shines very beautifully. The Japanese name for this color is "Arai-shu".Even among the Japanese, the origins of this name are not are not generally known. The dye in textile fabric begins to lighten after many launderings. In the past the Japanese would describe light colors with the term "arai" which means "wash." Japanese deep red is called "shu" so "arai-shu" is the most brilliant and lightest of urushi colors. Nakaya pens do not come with a converter.