Tortoiseshell pattern has a long tradition in quality writing instruments, with its usage dating back to the 18th and 19th centuries, when actual tortoise shells were used for decorating jewelry and lacquerware. The M101N Tortoiseshell Special Edition uses cellulose acetate to mimic the tortoiseshell on the barrel in a time-intensive process that creates a striking pattern. The dark red on the cap ends is made from high quality resin, and adds a vintage feel.