This Staedtler Lumocolor Whiteboard Marker (Bullet-Tip) Set of 4 comes from a range that has been growing for 50 years. It's perfect for teachers or anyone who uses a whiteboard for presentations or to make notes. The 2mm bullet-tipped markers contain patented alcohol-based ink in vivid trend colours that dries instantly but can be dry wiped from boards without leaving a trace. As the ink can be dry wiped without leaving a trace, these whiteboard marker pens can also be used on glass and porcelain. They're refillable and dry-safe, which means that you can leave the cap off for up to 14 days without them drying out.