You can use this EcoLine 28 blue whiteboard marker from Edding in the office, during presentations or lectures. It has a round tip and a writing thickness of 1.5mm - 3mm. The ink is erasable on non-porous surfaces. Forgot to put the cap back on? Don't worry, it won't dry out. Not even after a few days. The housing consists of 90% recycled plastic and the ink is easily refillable. This makes this blue marker an environmentally friendly choice for your whiteboard.