GRAF VON FABER-CASTELL Classic Grenadilla (18K nib & converter) Fountain PenGrenadilla warmth with precise gold nib performance The Classic Grenadilla fountain pen is made from a naturally dark Grenadilla wood barrel with the signature look of the Classic line. Unlike resin Guilloche models, this version introduces a warmer, organic writing feel, that ages and darkens with you. Why you'll love it Solid Grenadilla wood barrel with rich natural tone 18k gold nib, super smooth, wet, and consistent Solidly made cap, with spring