Best lock for air travel to deter easy access to your belongings.  Especially like how they hold up over the years of abuse I've thrown at these (have bought quite a few over the years and eventually end up having to "lend" them to relatives and friends who need a lock or two for air travel.  The number wheels turn nicely and easily whilst still providing appropriate firmness and tactile feel for each number as you line up your sequence to lock / unlock it.  I've found other brands who have a similar design - don't feel as good and make getting the numbers lined up a little more difficult.