These wet-wipe chalk markers are suitable for a wide variety of surfaces including glass, whiteboards, and chalkboards. These prominent liquid chalk markers produce a chalk look without a chalk mess, are a valve-action, and can be removed using a damp cloth. Used for indoor advertisements in shops, florists, pubs, bars, and restaurants. Please note, these markers can be easily removed from non-porous surfaces with a damp cloth.This Marker has a 6mm Broad Tip.