The Pentel Tradio pen features a flexible fire tip that can create a variety of line widths, from thick to thin, depending on the angle and pressure. has a flexible nib which creates a variety of line widths, from thick to thin, depending on the angle and pressure applied. Its delta-shaped nib provides a special writing feel that is very similar to a felt-tipped pen. The fiber nib will wear to the style of the writer as the time when by and then offers a unique writing experience. It provides rich water-based ink dries quickly for writring, sketching and drawing.