Good markers that can get dirty when erasing it from glass or metallic surfaces. Its great for writing on cups and wine glasses. On the flip side, my sister drew on the mirror and it was a mess when I tried to erase it. I think more engineering can be put into erasing it by turning writing into powder. But overall it is good. #vinoroyalehttp://www.amazon.com/VinoRoyale-Wine-Glass-Markers-Enthusiast/dp/B01AAE83TU