Kaimei Natural Hair Sumi Brush Fountain Pen - Black Barrel Replacement Tip - 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. Made in Japan, with superb attention to detail and quality. This replacement tip will fit the black, blue, and red Kaimei pens. The body of the replacement tip is black. Red and blue bodies are available via special order; please call or email to inquire.