Button Magnets on this page are especially designed for use on Magnetic Glassboards. These 1.2″ Diameter Button Magnets are designed for maximum strength in a smaller form factor. These magnets will hold 20 sheets of paper on a 1/4″ Magnetic Glassboard. Available in a variety of colors. May also be used with porcelain boards or Magnetic Whiteboards; however, but they may be difficult to remove once attached.