Polk Audio ZM4119-A Hinge Headphone, Black (Refurbished) Ergonomically designed headband and pivoting ear cups ensure the buckle conforms to the shape of your head for a comfortable, secure fit Superior materials, including durable, lightweight aluminum, stitched leatherette over a generously padded headband top and bottom, and virtually maintenance-free ear pads for years of extraordinary performance. Built-in 3-button control and microphone give you intuitive one-finger control for audio and phone calls. A single detachable cable connection means a lot less tangle and a lot less hassles. Polk, world-renowned for its sound quality since 1972, chose a 40 mm driver made of lightweight, durable PET material, housed in a vented enclosure.