Material: made of foam and felt, lightweight and durable, can you a long timeSize dimension: 1.97 x 1.97 inch or 5 x 5 cm, the thickness is 0.79 inch or 2 cm, suitable for both children and adults to useEasy to use: contains soft magnetic, can stick to metal chalkboard and surfaces easily, help to save space, a necessary for classrooms, home, officeWashable chalkboard erasers: can be cleaned repeatedly, wash with soap and water, air dryCompatible with white or black boards, dry erase sheets, melamine, porcelain and glass surfaces, to clean the whiteboard effectively, you need to press the erasers a little bit harderColour: as shownMaterial: FoamandfeltPackage Contents:30 x Eraser (blue, green and yellow 10 pcs each)Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.