Build Solid construction for earpieces. However after close to 2 years of usage the canal duct which the silicon sleeve sits on came loose from the main earpiece, not totally but loose enough to affect the quality of sound, especially bass. Wire was durable, however it oxidizes easily, and the oxide seeps into the main earpiece from the memory wire, which I think may compromise the integrity of earpiece in long run. Lots of micro phonics though.   Sound One of the more neutral iem I have came across. The bass is tight...