The Mako pen draws the inspiration for its design from the shark of the same name. It has a sleek, streamlined shape that looks as if it would easily cut through the open water. There are even some small slits in the sides of the cap, that mimick the appearance of "gills". It's a neat looking pen . The pen has a substantial feel due to its weight. The barrel is a emerald green marble pattern .The cap is a black lacquer finish that clicks on securely. The iridium nib is a fine-medium and writes very smoothly . In summary, the Duke Mako is a very unique pen that combines the best of Asian artistry and German design. It is solidly constructed, and has a look that is sure to elicit compliments from all who see it. Length(Approx): 134 mm ; Weight(Approx): 40 g ; Diameter(Approx): 13 mm , Cap : Push Type ; Take International Cartridges.