Staedtler's permanent marker pen for laundry is a new and practical development from the Lumocolor range. As a laundry marker it is also waterproof, so you won't need to worry about the text disappearing in the wash. The permanent laundry marker can be used for writing names in school shirts, marking before alterations and other permanent marking tasks. Fine Line, 0.6mm. Ink, Black. Permanent ink. Purchasing each unit.