Audio-Technica ATH-A550Z Art Monitor Closed-Back Dynamic Headphones Audiophile-quality headphones with metallic finish Newly designed 53 mm drivers with CCAW Bobbin-wound voice coils Top-mounted PCB contributes to smoother airflow for precise diaphragm movement Double air damping system (D.A.D.S) for Deep bass reproduction Proprietary 3D wing support system for excellent fit