"uni Pin" is one of the most well-known products in ultra-fine tip marking pensThe Pin's nib provides smooth ink flow, which is ideal for writing, drawing and designing.New BOLD series added to the PIN line-up provide consistent bold line.Combination of the new bold line-up with the existing thin range enables richer expressionBold tip is suitable for creating strong & firm lines or for filling. It is also useful for writing notebook tiles and framing.Pigment ink: The ink has superior water resistance, so once it dries, the ink will not smear,even if you spill water on the page. It also has light resistance and it will not fade undercontinuous exposure to light.