Nib and converter are schmidt. Used eye dropper or with converter. Please let us know if you will use eye dropper. Diametr cap : 16.5 mm. Our pens are completely handmade. The decorations on it are completely handmade and made with a brush. It is definitely not a photocopy. And we used real gold for some of the decorations. There is a three-layer coating that protects the decorations. Make your writing experiences with our ergonomic and artistic fountain pens. This item is made of rosin and steel.