The ultra-light KSC17 Stereo Headphone delivers high quality sound in a behind-the-head design that folds into an ultra-compact configuration that tucks neatly into a gym bag, backpack, or briefcase. Dynamic elements, constructed from mylar for enhanced rigidity, minimize mechanical distortion and yield a full frequency. Neodymium iron boron rare earth magnet structures enable the KSC17 to deliver greater volume, even with low-voltage portable devices. Oxygen-free copper voice coils improve signal transmission and conduction for cleaner and clearer sound.