The TWSBI Precision Fountain Pen in Gunmetal is a stylish writing instrument that complements TWSBI's Precision mechanical pencils and ballpoints. It features a piston-filling mechanism with a very smooth action. The pen boasts an aluminium barrel and grip, accented with stainless steel trim and a pocket clip. The TWSBI logo is elegantly placed on the top of the pen's cap. A rubber o-ring on the cap thread ensures an airtight seal, preventing ink from drying out and keeping the cap securely attached. The diamond-faceted barrel design prevents the pen from rolling when left uncapped on a desk. The polished steel nib, engraved with the TWSBI logo and branding, is available in various sizes. Please note that piston-filler pens cannot use cartridges. The pen is supplied gift-boxed. Like all TWSBI fountain pens, this model can be fully disassembled for cleaning and servicing, with instructions and tools included. However, disassembly is recommended only for experienced users and is not required for normal operation. Disassembly is undertaken at the user's own risk.