Kaimei Sumi Brush Fountain Pen (Natural Hair) - Blue Barrel - This is one of the finest Sumi brush pens on the market. The hair is 100% natural weasel (sable) hair, which is extremely durable and holds up extremely well to black Sumi ink. The brush length is 3/8 inch and tapers to an ultra fine point. The pen body itself is metal and durable resin. Features a metallic gold pen clip. The pen length (when closed) is 4-5/8 inches. Beautiful and functional! Made in Japan, with superb attention to detail and quality. Replacement tips and ink cartridges are available separately. The pen body alone on this pen is deep blue; the ink inside is black Sumi ink.