A Fountain pen with a metal nib, comes in different thicknesses: F, M, B. The pen can filled with ink from an inkwell or with cartridges. The Roller pen, is equipped with a soft writing refill. The Ballpoint pen, is integrated with a rotary mechanism at the top of the pen. The Mechanical pencil has a point of 0.7 mm with an extra large eraser at the base of the pen. Besides the standard nib sizes of M and F it is available in :
Extra Fine EF
And special nibs made for calligraphy writing such as OB, OBB, OB1.1, OB1.5.
Dana Pens can pair a suitable nib for the fountain pen of your choice.