Well, how many times do you lose the earring stabilisers? They kind of fall off at the most inconvenient time. But, getting replacements for them so often means getting new earrings which is time consuming and irritating. This supplier had the good sense to have these replacements and they are well priced. It has allowed three pairs of earrings to be used again, and the fear of losing the backs is no longer an issue. Just put in the order - the stuff arrives in good time - and it works.