Red 4 Digit Combination Padlock for Luggage or Backpack Material: zinc alloy Product size: about 2.4 x 1.18 x .56 inches / 6.1 x 3 x 1.4 cm Initial password: 0000 Reset password 1. Adjust the password to the initial password 0-0-0-0 and align it with the password mark 2. Lift the lock hook, rotate it 90 degrees counterclockwise, press the lock hook hard and turn the password wheel to select the four-digit password you need and align it with the two small triangles on the password mark. 3. Rotate the lock hook 90 clockwise to restore it to its original position, press the lock hook, shuffle the password, and the new password is set successfully. Not TSA approved