Passive Noise cancelling to reduce the outside noise, enjoy the music more. Meticulous Design - Pure copper metal body with gun-metal colored surface for unique visual experience and high-grade metallic feel. Braided TPE cable with Kevlar fiber wrapped in copper wire for anti-winding, and the sturdiness and flexibility for long lasting use. Ear chip designed naturally fit into the ear canal, skin-friendly, comfortable and enjoy music without fatigue.