Unfortunately, I was disappointed by the product. To be more accurate, it mainly affects the black whiteboard marker. I've been using my whiteboard mainly for formulas and graphs, and how that's just so, you can then stand before a couple of hours. Here the great disadvantage comes into play. If the color is once dried, it is only with great effort possible to remove the writing again. This problem does not exist with the previously used by me pins.
Conclusion: Unfortunately, I can not pronounce a recommendation to buy !!! Why won 2 stars? -> As to me the color of the pins like better than that of no-name products.