Audio Technica Solid Bass ATH-WS33X Closed-back Dynamic Headphones, White 40 mm drivers deliver significantly more bass reverberation Newly developed Double Air Chamber System expands bass output for powerful bass without sacrificing audio clarity New headband design for greater comfort, better acoustic seal and accurate delivery of bass Smooth, easily adjustable stainless steel headband slider ensures a comfortable fit 1.2 m Y-type cable and L-shaped stereo mini plug for portable devices