Water soluble marker that does not have any odor, and has excellent lightfastness and vibrant colors that can be used to overwrite; Abrasion resistant and does not flow through water when dry, so it will not get dirty to the touch; Vibrant colors allow you to write on dark colored tops; Can be written on metal, glass, plastic, and photos; For use with posca medium round core; Color refill; Letter size: Medium Point; Shaft: PP resin