The Stipula Suprema Nuda demonstrator fountain  features the 14K Gold nib that is extremely flexible and smooth-gliding. The clear Nuda pen is equipped with the Torricelli Air Pump filler system, an engineering breakthrough in pen design. The pump completely displaces air in the chamber allowing ink to fill the pen body. Watching the ink suddenly swell into the pen makes filling a whole new experience! The Suprema Nuda fountain pen is available with regular fine or medium nib for your extended writing pleasure.