• Easy to replace the nib by twisting it out and back.
• These nibs are not standard size, they are only compatible with Hongdian black forest fountain pen 3 PCS Hongdian Fountain Pen Nib, 1860 Max, 1837, 660, and N8 series
• Package: 3 nibs with black section ( 1 x EF nib 0.6mm, 1 x F nib 0.7mm, 1 x Medium Nib 0.8mm)