Sakura Pen Touch rich inks lay down exciting impressions on most papers and many non-porous surfaces like glass, wood, porcelain, plastic and metal. Low-odor and xylene-free. Not for use as correction fluid. UV Extra Fine/Fine/Medium 3 pc- Features ink that is invisible by daylight and lights up under black lights. They are chemically stable, waterproof, fade-resistant and permanent on most surfaces. Includes three pens: extra fine, fine and medium nib sizes.