As I said above, at the place where I enquired I was told that the filters would be reusable, and only the mold would have to be replaced, which would bring the cost of the new custom-made earplugs to one half of their original price. Ask, just in case. Thanks for this information. I've been, and still am, a user of earbuds for listening to music while commuting. I dislike listening to loud music, and I don't feel the need for the music to mask completely the noise around me, so the music is there in the background, and I was under the -false, I see now- impression that doing this wouldn't harm my ears. But I hadn't taken SPL into account. I suppose headphones with noise reduction aren't harmful, since they allow listening to music at a really low volume. Or should we also avoid them? I've been thinking of getting ones for some time, but I haven't found any place where I can try them before, and I cannot make up my mind to buy without checking the sound quality first.