Massdrop X HIFIMAN Edition XX Over the Ear Wired Headphones - Black Description: Condition: New Opened BoxFeatures:Massdrop x HIFIMANOpen-back principlePlanar magnetic driversCharcoal gray and silver colorwaySpring steel and hand-stitched protein leather headbandHybrid ear pads with fabric and synthetic leatherAdjustable slidersSteel gimbals and Allen screws with black oxide finishSilver printingLaser-etched serializationImpedance: 20 ohmsSensitivity (at 1kHz): 93 dBFrequency response: 8 Hz–50 kHzCable: 5.5 ft (1.7 m), removablePlug: ⅛ in (3.5