I only received 19, and they were haphazardly thrown in a little brown box without a little plastic bag (judging by other reviews, this is a common problem and Noctua doesn't seem to care -- order from somewhere other than revain). I'll update this review after I see how it affects noise and vibration, but needless to say I have a fan installed that only has three rubber mounts.Edit: They seem to work well? I have cheap fans so it's hard to say. Also, the grips are a bit too long, so they'll push up against your case's faceplates. You'll have to tape them down or something.
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