Size: 12*10*16*4.2mm EXCELLENT MAGNETIC - Each magnet can hold up to 20 sheets of A4 paper, photos, notes, etc.; NOTE: These magnets do not fit on glass magnetic plates or glass magnetic plates Premium Quality - The magnet surface has three layers of coating: Nickel-Copper-Nickel. This protects the magnet from corrosion and significantly increases its durability. The final layer of nickel provides a smooth surface that won't scratch anything. Very convenient to use - they have a nice and easy-to-grip shape that is easier to detach than round magnets. Wide range of applications: You can choose from countless ways to combine these magnets. Like pinning paper to a refrigerator or whiteboard, hanging family photos, and making mockups. Let your imagination run wild, magnets can help you do many things WARNING - Small parts present a choking hazard. Have the patient use a pacemaker or defibrillator