Material: It is made of natural wood. It is durable. It is easy to write on and easy to clean. So the chalk pens come off really easily with just water in a paper towel. It can save a lot of trouble. 4pcs: It includes 4 picecs. And each color will come 1pcs. There are 4 colors such as pink, red, blue and yellow. The extra amount you can put elsewhere. Let this little chalkboard add a splash of color and fun to your room. It is worth buying. Suitable Size: The size is suitable for hanging in smaller places such as doorknobs. It is very convenient. Here is size information for you: About 3.54 inches (90mm) wide, 8.66 inches (220mm) long, 0.20 inches (5mm) thick, and inside diameter: 2.95x2.44 inches (75x62mm). FunctionIt has multiplefunctions. You could use it as do not disturb, please clean, welcome sign and so on. In the meanwhile, you could use it as work schedule. It will be obvious to be seen and easily to be changed. Your life will be simpler because of it. And you can also use it as a decoration. It is good-looking. Wide Application: It is ideal for office, kitchen, garden,clinics, law firms, hotels, startups, group project, schools and home. And it is great memories maker for using at any places and occasions, like birthday party, wedding or other festive event.