HIFIMAN SUNDARA Closed-back headphones. I purchased these used, in excellent condition, from a flea market site and listened to them for a total of about 5 hours. After that, I stored them away, so naturally, there are no noticeable scratches. However, please refrain from purchasing if you are overly concerned about minor imperfections. Returns are not accepted to prevent swapping. [Brand] HIFIMAN [Model] SUNDARA Closed-back [Type] Headphones [Color] Orange系 (Orange-based) Sundara Closed-Back Closed-back Headphones Brand: HIFIMAN Construction: Closed-back Wearing Style: Over-ear, integrated left and right Headphone Type: Headband Color: Brown系 (Brown-based) Headphone Features: Detachable cable Low Frequency Response (Hz): 6.0 Hz Wireless/Wired Connectivity: Wired Driver Type: Planar Magnetic Plug Shape: Standard plug/Mini plug Impedance (Ω): 20.0 Ω Sensitivity (dB): 98.0 dB Weight (g): 432.0 g