They do exactly what I wanted/needed: they fit the headphones better and more firmly, offer enhanced sound clarity and block out ambient noise. They hold the earbud low in my ear and prevent it from eventually slipping off (a common problem for me with silicone earbuds), allowing me to hear more detail in my music. In fact, they turn ordinary headphones into pseudo-noise headphones. For me, the tighter fit also eliminates the need for earhooks or other stabilizers needed to keep the headphones in my ears. I would give 4.5 stars if I could but the only thing holding me back from giving a full 5 stars is the price. In my opinion, that's too much of a premium (although if they hold up well, I'll probably buy them again because there's nothing quite like it).
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