Tombow Mono Blue Dual-tip Highlighters with durable broad chisel tip and extra-fine bullet tip in one pen. Resin-coated tips and polymer-coated core prevent tip breakage or staining rulers, eliminating unwanted ink transfer. Protective plastic sleeve on the chisel tip maintains shape even when used with metal rulers or stencils. Vibrant, fluorescent colors are perfect for color-coding and calling attention to important text. Fine tip works great for underlining and writing margin notes.