The magnetic stripe on the bank card is magnetic, and direct contact between the magnetic stripe and the magnetic stripe may demagnetize. When multiple cards with magnetic stripes are stacked, it should be: 1, and the faces with magnetic stripes should not be placed opposite each other to prevent the two magnetic stripes from contacting directly; 2. Two adjacent cards should be stacked at 180 degrees, so that the first magnetic stripe is on the left, the second magnetic stripe is on the right, and the third magnetic stripe is on the left ... There is a distance between the third magnetic stripe and the first magnetic stripe, which is very safe.