The Stipula Etruria Netto Netto ink refilling system contributes to the correct maintenance of fountain pens through a clean filling system that utilizes every last drop of ink. This cleverly designed system allows you to fill your fountain pens without dipping the nib and the grip directly into the ink. Although difficult to explain, when you see it in action you'll be amazed. And since you don't have to expose barrel materials to ink your pen will benefit from less discoloration or tarnish.