Etymotic ER-4 Filters

If your Etymotic ER-4 series (ER-4B, ER-4P, and ER-4S) are sounding muffled, distorted, or one channel has gone dead, chances are the problem is a filter that needs replacement. These tiny, green filters keep the drivers of your Etymotics protected from earwax and other debris, while at the same time replicating the pinna reflections of the ear. They come in packages of six (three pairs).