Kaimei Sumi Brush Fountain Pen Natural Hair - Red 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 barrel alone on this pen is deep red; the ink inside is black Sumi ink.