The 10pk Linkyo Chalkboard Markers are just as fun as the 20pk, but better if you only need a few. Bright fun colors. They mark on nonporous surfaces and wipe off easily. The kids mark all over the windows and the sliding glass door in our house. They don't have a smell so it makes it a little better to use than expo markers, which I think stink. I did recieve mine free in exchange for my honest and unbiased review.