These fluorescent markers are perfect for writing on windows, marker boards and black boards. Messages can be changed frequently with these fluorescent pens, as they are easy to clean by using a damp or wet cloth.Bright Stick Erasable Fluorescent Markers for use on black marker boards, fluorescent light boards or glass. Bright colors take on a neon look under ultraviolet light. Use Bistro Chalk Highlighter Pen on chalkboards, dry-erase boards, light boards, windows and windshields. Opaque, water-based, pigmented formula is erasable with a damp cloth.Pen-style markers let you write clearly, without ink bleed-out that can blur lines.