White boards
White boards are often used in school by teachers for writing things down showing work or just drawing when no one is around. They are white and smooth and hang on walls so the class can see them.. They are made a certain way so that the white board pens oils don’t soak in but don’t just run off of the board they are made so thy clean easy too. They can be a variaty of sizes they are some times magnetic on the back to stick to things. This picture is from www.numonics.com/ ipdindex.html