Asvine P36 Titanium Fountain Pen Piston Filling, Bock Medium Nib Clear Transparent Acrylic Smooth Writing Pen Case Set, Torpedo shapeDurable Material All parts are from high grade titanium and acrylic. The superb titanium is well known for the extremely high durability and exceptional light weight. Well Balanced for daily writing The ergonomic titanium section has a no slip design and ensure you have a comfort grip for long time writing. High Ink Capacity The pen's built in piston filling system holds far more ink than a cartridge and lets you draw ink straight from the bottle, no