NATSUME-M size (TANSHIN[RED])[NATSUME] Fountain pens of Ebonite Ebonite is made from natural rubber and sulfur. Ebonite is formed by chemical reaction by mixing and heating them. Touch of ebonite is good to hands, so that you will never get tired for long writing. Pens are made of our original color marbled ebonite, hand made by our craftsman. Thus, each pen has their own texture, never same as others. Origin of name Simple form with smooth feeling and the flat head cap. We named