The Carroll OneCard can be damaged if proper care is not taken. Avoid bending or defacing the card. Take special care of the magnetic strip that is printed on the card. Avoid scratching the magnetic strip. Keep the card away from magnetic fields that may demagnetize it – televisions, stereos, microwaves, and any other electromagnetic equipment. If the Carroll OneCard gets dirty, wipe it with a damp cloth and dry with a non-abrasive cloth. Please do not punch holes in the card or attach the card to a key ring.