What distinguishes the P'3150 series is the combination of unusual materials. The basic element is a cylindrical barrel made of stainless steel that is painstakingly brushed. A characteristic of this series is the leather-coated shell that encases the barrel. The leather shell is made from the only the finest calfskin. An Elaborate tanning process renders it stable, tough, and and the same time, smooth and supple. A very convenient feature of the fountain pen is the cartridge converter system, meaning one can either fill it from an inkwell or insert a cartridge. The 18 carat gold nib is rhodium-plated and medium line width.