Souvern – A world-famous classic. The deep black casing is subject to an elaborate process. The material of the casing is made of high-grade resin and it takes months until it is finished, whereupon the tailor-made plating is curved and cut into a contour using a natural diamond. The characteristic double rings are then integrated into the cap and barrel with the utmost precision. The writing instrument is then polished until it reaches a brilliant luster. The M1000 fountain pen with a piston filling mechanism has a 14-carat bi-color gold nib with rhodium trim and is available with the nib sizes EF, F, M, or B. The EF nib creates an extra fine typeface and is suitable for handwritings with small swings. Specifications: Material: Resin Trim: 24k gold Length: 147 mm / 5.8 inches (capped) | 177 mm / 7 inches (posted) Diameter: 14 mm /0.6 inches Cap: Screw-on Postable: Yes Nib: 14k gold, rhodium trim Available Nib Sizes: Extra Fine, Fine, Medium, Broad Filling: Piston