The whiteboard eraser is made of felt cloth, lightweight and durable, and it can serve you a long time. It is compatible with white, black boards, dry erase sheets, melamine, and glass surfaces, to clean the whiteboard effectively, you need to press the erasers a little bit harder. Feature - Color: At random. - Material: Felt cloth. - Size: Approx. 6.2 x 3 x 0.8cm. - Clean any large or small board easily, no need for sprays or cleaners. - Eco friendly, non-toxic, no smell. - Felt bottom surface easily removes all dry erase ink from any dry erase board. - Great help to managers, teachers, students and children. - Suitable for home, office, school, dormitory, game room, play centers etc. Warm Tip: Dear buyer, due to lighting effect, monitor& 39;s brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand Thank you