Prior to that, there were folding headphones in the previous series; after using them for a year and a half, they flew for replacement components. In addition, we had two of these headphones; they were both purchased at the same time and both flew simultaneously. Generally speaking, you might anticipate better build quality and more expensive plastic from Sony. Visually, it doesn't seem good, but it's disintegrating more quickly than anticipated. Despite blowing off dust from these, it's interesting how soon they will disintegrate.