The lock is a 3 digit resettable combination giving enough security to not allow the password to be guessed whilst still being memorable to you. The lock bar is designed to be able to fit within most lockable zips allowing you to get the most use out of it. Made from zinc-alloy with a hardened shackle the lock is built to last and withstand general airport wear and tear. The TSA lock design allows for airport security to be able to open it without breaking off the lock, though it is still unopenable to anyone else ensuring your belongings stay safe.