We are a dental office, and we accidentally ordered our appointment cards in a glossy finish last time instead of matte. Conventional pens won't even make a mark on the gloss. But these sharpies are perfect. The tip is ultra fine like a pen, the ink dries as it writes and doesn't smudge at all. And we don't use them for anything else, so they don't get misplaced. I'm so glad we had some of these in the office when we needed them!