Button Magnets on this page are especially designed for use on Magnetic Glassboards. These 2″ Diameter Button Magnets are completely sealed in plastic, and are designed with the large size to make them slightly easier to remove from surfaces. Often used in classroom setting, where smaller children are present. Designed to hold 20 sheets of paper on a 1/4″ thick Glassboard, and are available in a variety of colors. May also be used with porcelain boards or Magnetic Whiteboards; however, they may be difficult to remove once attached.