Astell&Kern AKR02 Balanced Armature Earphones (Silver) Custom Balanced Armature Drivers with Balancing Air Movement (BAM) Technology Fully detachable Oxygen-free Copper cable and connectors - Produces clearer sound Premium Italian leather case lined with Chamude fabric and embossed serial number on metal place Includes 3 sets of ear cups (S,M,L) AKR02 maintains clear range in high frequencies and overcomes the deficiencies in low frequencies normally found in traditional BA units