Magnetic Whiteboard Eraser:The magnetic erasers are designed with weak magnetic and can stick to most magnetic whiteboards, not easy to fall off or lose. Can only be used for regular whiteboards, not for soft whiteboards and glass boards Quality Material:Made of premium quality EVA material and felt fabric,washable and reusable Package Content: There are 4 pieces office whiteboard rubber, 4 colors yellow, blue ,red and green Size: The size is 7.4*4.5*2 cm. Our erasers have an ergonomic grip that makes them comfortable to hold and can be used with either hand and fit any hand type Versatile Usage:Can work with chalkboards, whiteboards, dry erase boards, and other types of white boards, widely use in school, workplace and home