I ordered this to replace the screen type infuser that came with the cup when I ordered it some time ago. It fits well and, the best part is that it filters out far more of the fines. And it's pretty easy to clean. But wait, there's more: I discovered while rinsing the infuser, that, when held at the correct angle under the running faucet (and assuming a strong enough stream of water), it emits a tone. The 2 screens I have each emit a different tone. Wish I could upload a short video. TIP: I now have 2 of these screens, so I use one to steep and then use the other to squeeze the spent leaves. Works great. It would be nice if these came with maybe a plastic "fake" screen/insert to squeeze the tea from spent leaves for cleaning.