Audio-Technica ATH-M40x Professional Studio Monitor Headphone, Black Cutting-edge engineering and robust construction 40 mm drivers with rare earth magnets and copper-clad aluminum wire voice coils Circumaural design contours around the ears for excellent sound isolation in loud environments 90 Degree swiveling earcups for easy, one-ear monitoring Professional-grade earpad and headband material delivers more durability and comfort. Removable cable