Our combination lock is an easy to operate luggage lock. The 4-digit TSA lock allows you to easily set your own combination and is reprogrammable. The 4-number combo lock provides 10000 unique code choices VS 3 number locks. It cannot only be used as a suitcase lock or travel lock but also outdoor lock on gates, fences, storage units, sheds, meters and is rust free. Our TSA approved locks are perfect as lock for lockers, backpack lock, gym locker lock or any school locker lock. Made of zinc alloy. The code numbers on this lock are written in black with a silver background, providing easy readability and a cool design. Ideal gift for friends, classmates and travel mates.