The build quality is superb and it is surprisingly heavy for its size. I dried one pair using the dryer and the other pair I let air dry. 2mm beryllium coated dynamic driver and a 30095 balanced armature. Assembly was way more complicated than it should have been. Ill try to keep them for ever. It wasnt as I expected. ? No traen comandos por voz. The bamboo box is sturdy and beautiful. The microphone on it works so good on it. Value for the money is a 4, but all the convenience makes this a 5, if you get one that doesnt have the problems pictured.