I readily admit that I have no idea whatsoever as to what these keys are supposed to lock or unlock. The idea of a "postage guaranteed" keychain is a nice idea, but even if I were to lose the keychain and have it returned to me, I wouldn't know what to do with the keys.

The other keychain, on the other hand, has a story to tell. My mother is no longer up to making a trip to Israel. When she has in the past she's brought alone these keychains as gifts. I even know a number of people who still use them. I like it, but it's too big for my pockets.