These were well packaged and feel sturdily made. They sound surprisingly amazing (I have used them to make SennGrados by putting them in a Grado housing). They sound very smooth, and have strong and clear bass that doesn't distort the rest of the sound. They also somehow make the soundstage feel quite wide and deep (not sure how since they're in the same housings I've used before, but they do) Probably the best sounding drivers for my purposes that I've gotten so far, rivals the K701 drivers. I'd definitely recommend these.
good quality. as original ones. the sound is perfect and clear as well. I have replaced in HD 4.50 all good. recommend