Manuscript Cartridge Pen General Handwriting Leonardt Dip Nib Box 24pc- Box of 24 replacement fine writing and drawing nibs, model G. Long lasting, slightly flexible steel pen nib capable of fine and modulated lines. Fantastic for illustration or calligraphy. Commonly considered the standard for comics and manga. Nibs have a 6mm mount size and should fit in most standard western or Japanese pen holders.