uni PIN is the most prominent name for ultra-fine drawing markers. The pin tip of the PIN provides a smooth flow of ink, which is ideal for writing, drawing and designing. These 3 new cutting nibs added to the PIN series are suitable for combining thick and thin lines, such as calligraphy. Cut nibs can draw much cleaner lines of different widths, from thick to thin lines, creating beautiful letters. Because the tip's slightly curved top reduces friction between the paper and the tip, it provides smoother writing than other competitors. Also, the special ink used for the uni PIN does not bleed through easily and allows for clear letters to be written.