Audio Technica ATH-M40x Closed Back Monitor HeadphonesCutting edge engineering and robust construction 40 mm drivers with rare earth magnets and copper clad aluminum wire voice coils Tuned flat for incredibly accurate sound monitoring across the entire frequency range Circumaural design contours around the ears for excellent sound isolation in loud environments 90 swiveling earcups for easy, one ear monitoring Professional grade earpad and headband material delivers more durability and comfort Detachable