Tombow MONO Edge Highlighter. Dual-tipped, slim-barrelled pen. One end is the traditional chisel tip, which can be used in the usual fashion to mark a 4mm line, or turned on its tip or side edge to create finer lines. At the other end of the pen is a fine bullet tip, perfect for underlining.

Speaking of underlining, if you're using a ruler, the tips of the MONO Edge are protected by plastic sleeves, so the ink will not transfer from the tip to the ruler edge, so there's no risk of smudging!

Available in a selection of bright colours and suitable for use on most types of paper.