Precautions: Magnetic fields can damage or erase any type of magnetic data storage. They can also distort computer screens. Keep a 3-4 foot distance from: music and video tapes, computer software, credit cards and bank teller cards. Keep a 5-6 foot distance from CRT screens. Magnetic fields can effect instrumentation such as: watches, pacemakers and/or automatic internal defibrillators, as well as surgical pins or plates. If you use any of these devices, please do not maintain close proximity to a strong magnetic field. Use of magnets during pregnancy should be avoided. Strong magnets can snap together very quickly and pinch fingers or cause the magnets to break when two or more come within 4 of each other. Dropping magnets on a hard surface may also cause breakage.