Etymotic ER38-46 Filter Changing Tool with Filters for ER-4/HF Series - Green

you only get 4 filters.

I do find these expensive for what you get. You should get many more for the price. It's kind of a ripoff.

My ER4Ps are over a decade old. Rarely do I need to change filters, but my spouse borrowed my headphones and completely clogged one side, given that there was no sound. It almost seemed like the channel went bad, but the test is removing the old filter and listening for sound.If you still have the case that came with your headphones, you may have the tool already. I see on their website you can buy just the filters, but purchasing here with the tool was more convenient for me. They sound much better, as I had been listening with partial attenuation for some time. Parts look authentic.If you channel is actually bad, you can send your headphones to Etymotic Research for repair. I did that once years ago, and it was something like 50.

ER4Sのメンテナンス用に買いました。発売から時間が経っていますが、変わらずに使えるようです。ただし、元々付いているものは筒が金属製で、こちらは樹脂製でした。私は音質に大きな変化は感じませんでしたが、オリジナルの響きにこだわる方は考慮されたほうがよろしいかもしれません。

Exact replacement parts.

特に手間もなく簡単に変えられました。結構耳垢が入ってしまうので定期的に変えたいですね。