Great for suitcases, backpacks, computer bags and most carry on items. Made of zinc alloy, the zip lock is durable, and with the unique skull design, this is an affordable yet practical kids gift. To use, set the initial password to 0-0-0. Press in the hole on the side of the lock with an object like a pen then set your personal 3 digit password. Simply feed the cable of the lock through the zip pull tags, then press the lock together to secure your belongings.