HE400SE HIFIMAN Planar Magnetic Open-Back Headphones

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This product is the HIFIMAN HE400SE.
I purchased it new on Rakuten Ichiba in March of this year for 13,145 yen.
These are planar magnetic headphones, and while I really like the sound quality, they don't fit my head shape well, so I'm selling them as I don't use them often.
The cable is detachable, and a 6.35mm adapter is also included, so I believe even those particular about their music will be satisfied.
Included items:
Product description copied below

[Product Description]
The HIFIMAN HE400se is an open-back headphone featuring a uniquely designed planar magnetic driver. Connection is made via the included cable with screw-on connectors, using separate ground wires for each channel to minimize crosstalk. It employs acoustically transparent Stealth Magnets, which, unlike conventional magnets, allow sound waves to pass through freely due to their special shape without causing interference.

● Newly Designed Headband for Lightweight Comfort
The HE400se is 30% lighter than other planar magnetic headphones in its class, allowing listeners to enjoy music comfortably for hours. Furthermore, the newly designed headband and hybrid earpads enhance comfort and improve sound quality.

● Features Acoustically Transparent Stealth Magnets
The advanced Stealth Magnets used in the HE400se are acoustically transparent and aim to dramatically reduce wave diffraction turbulence that degrades sound wave integrity. The result is reduced distortion and a purer, more harmonically rich sound. Unlike conventional magnets, the special shape of the Stealth Magnets allows sound waves to pass through freely without causing interference.

● Easy to Drive
The HE400se utilizes a double-sided driver to reproduce a realistic soundstage and dimensionality. With a high sensitivity of 91dB, it can be driven by ordinary headphone amplifiers and can also be used with portable audio players and smartphones.

● High-Performance 3.5mm Cable and 6.35mm Adapter Cable Included

● Frequency Response: 20Hz-20kHz
● Impedance: 25Ω
● Sensitivity: 91dB
● Weight: 390g