Title says it all. I lost one of the tips, so came up with my own solution. I grabbed some soft ear plugs, cut the fat end off, poked a hole through the middle and shoved it on my earbud. Amazing results. Isolation is about twice as good as the rubber tips, and I had a pretty good fit in those. No problems with them falling out of my ears anymore either. I didn't look for ear plugs that matched so they are a little goofy looking color-wise, but actually look quite professionally done. At work right now. Will post some pictures later if anyone is interested.