USP-105 Promark highlighter pens are a convenient easy to use pen style highlighter. Works on any office paper and produces vivid fluorescent ink highlighting. Each pack contains one each of fluorescent pink, fluorescent yellow, fluorescent blue, fluorescent orange, fluorescent green. The inkview window allows you to see how much ink remains. Features a pen clip to fit into the pocket for ease of use. Gives fine highlighter line width of 3.5mm