Tombow MONO Edge Dual Tip Highlighter

The Tombow MONO Edge Highlighter is double-sided, with one tip for highlighting lines and the other is 0.5mm to write, circle, and create diagrams. The thicker tip of the highlighter is 3.8 mm and has a plastic piece placed in a way that ensures the nib holds its shape. Many highlighters do not have a piece that reinforces the shape of the tip, causing the tip to become squished or dulled.