The WEP200 comes with three differently sized rubber grommets. This rubber grommet is placed over the ear piece and keeps the WEP200 in your ear. Unfortunately, this rubber grommet wears out rather quickly and then the WEP200 continuously falls out of your ear. I tried several times to purchase additional rubber grommets from Samsung, but they will not sell them separately and Samsung could not say where I could buy them in the aftermarket. This is the only user-replaceable wear part on the WEP200. When it fails, the unit, even if it is still functional, cannot be used because you cannot keep it in your ear. As it is, I have lost mine many times. This is the worst customer support I have ever seen.