4 BLACK MOST DURABLE TSA APPROVED AND RECOGNIZED LOCKS: All TravelMore travel locks are 100% Travel Sentry certified and designed from the ground up to be the strongest and reliable luggage locks in the market. TSA screeners are issued codes and tools for secured acces to open the locks. Our special high strength zinc alloy lock bodies, hardened steel shackles and patented internal mechanisms can take so much force that we back our product up with an 100% lifetime warranty. KNOW IF YOU HAVE BEEN INSPECTED: If a TSA agent has opened your lock and unlocks your suitcase, a red indicator will pop up on your lock under the steel shackle. In this way you can check to ensure all of your items are intact and present while you're still at the airport. You can reset it in seconds using a pointy object such as a pen or paperclip. MANY DIFFERENT USES: TravelMore combination locks can be used international on a wide variety of items besides luggage or suitcases. These heavy duty padlocks can be used on a backpack zipper, bagage, gym locker, pelican case, gun case, briefcase, cabinet, toolbox golf bag or laptop bag.