These pens are great for overhead projections, they don't smudge any slides. With three line widths, eight colors, water-soluble or permanent ink, whatever the need the OHPen is more than capable.
The non-slip grip allows for the best control to allow the most professional presentations. Not only for presentations, these pens are great for any professional pen needs. The permanent pens can write on virtually any surface, while the water-soluble pens don't smudge and wash away easily.