Our products are specially designed to help students who have just come into contact with addition, subtraction, multiplication and division. Guide students to learn the addition, subtraction, multiplication and division of less than 2 digits through the organized grids of different colors. After the children learned how basic mathematics works, we also provided a board to practice the addition, subtraction, multiplication and division of multiple digits. Our reusable classroom practice whiteboard is made with premium quality PVC board. It is lightweight but durable material, making it easy for students to use. Compare to other wood or paper number line, our PVC board is more difficult to be damaged. Also, you can wash it after using to keep it as new one. Our products are finished in a high-level manufacturing process. Smooth and hard surface of the board makes it very easy to write and erase, works great with liquid chalk pens and markers (not included) but not regular chalks.