Material: made of foam and felt, and durable, can you a long time Size dimension: 1.97 x 1.97 inch/ 5 x 5 cm, the thickness is 0.79 inch/ 2 cm, suitable for both children and adults to use Easy to use: contains soft magnetic, can stick to metal chalkboard and surfaces , help to save space, a handy necessary for classrooms, home, office Washable chalkboard erasers: can be cleaned repeatedly, wash with soap and water, air dry 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 Colour: as shown Material: Foam+felt Package Contents: 30 x Eraser (blue, green and yellow 10 pcs each) Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.