The Audio-Technica ATH-WS70 Solid Bass Over-Ear Headphones with Aluminum Housing features a newly developed Double Air Damping system that allows the WS70 to reproduce very strong bass for the unit. They also are using a full aluminum housing design to provide light and precise sound reproduction. The 40mm driver unit has large ear pads to ensure strong bass sound will not leak out. The clean and neat design also make this headphones one of the best pick for on the run music listening.