The Audio-Technica ATH-A990Z Closed Back Hi-Fi Headphones are high-res, sonically accurate headphones for studio or home use. They feature 53mm drivers and OFC bobbin-wound voice coils, allowing excellent transient response. This is due to smoother airflow that allows precise movement of the diaphragm. The Audio-Technica ATH-A990Z Closed Back Hi-Fi Headphones are lightweight and extremely comfortable. They ship with a connecting audio cable and 6.5mm stereo adaptor.