FIIO FT1 FIO-FT1-B [Ships from an authorized Japanese retailer, includes serial number] Closed-back headphones with 60mm large dynamic drivers

North American black walnut housing suppresses unnecessary resonance and reduces standing waves Equipped with a large 60mm dynamic driver that delivers deep bass Ultra-thin, lightweight, yet strong nano-wood fiber composite diaphragm delivers natural tone W-shaped independent suspension design minimizes energy loss by expanding the vibrating area Ultra-thin CCAW voice coil reduces the total mass of the vibrating system, achieving faster response and less reverberation Various physical sound-blocking technologies combine to deliver sound-blocking performance of 26db U-shaped acoustic damper improves the quality of low and infra-low frequencies Cone-shaped airflow guide minimizes attenuation of high frequencies Low impedance of 32Ω, making it easy to drive with a variety of devices 3-axis free rotation mechanism provides a comfortable fit