Features: Durable material: Made of premium foam and felt material, lightweight and durable, washable material ensures it can last for a long time use, wash it with soap and water and then keep it air dry. Convenient to use: It can stick to the metal chalkboard and surfaces firmly with soft magnetic, easy to store and help to save space. Wide applications: To clean the whiteboard easily and effectively, you could press the erasers a little bit harder. Compatible with white/ black boards, dry erase sheets, melamine, porcelain and glass surfaces, to clean the whiteboard effectively, you need to press the erasers a little bit harder. Specifications: ✔Optional sizes: 4.2 x 2.2 inch/ 10.7 x 5.6 cm ✔Thickness: 0.79 inch/ 2 cm ✔Material: premium foam and felt ✔Optional colors: blue, yellow, green, red ✔Quantity: 36 pieces Package includes: 36 x Magnetic whiteboard eraser ★Note★ Because of different batches, they may exist some extra felt on the surface when you receive, please blow them with blower or fan.