Quick search shows these were last this cheap in 2020.
Over-ear design for maximum wearing comfort for long work sessions
Sophisticated open technology for spacious and airy sound without compromise
Patented Varimotion two-layer diaphragm for improved high-frequency range and better performance at low frequencies
Unique flat-wire voice coil for higher sensitivity, better impluse and treble response
Specifications:
Headphone type - open
Sensitivity headphones - 105 dB SPL/V
Rated Impedance - 62 Ohms
Detachable cable - yes
Cable Length - 3 m
Earpads replaceable - yes
Maximum input power - 200 mW
Audio frequency bandwidth - 10 - 39800 Hz
Absolutely phenomenal headphones for the price, I’ve had a pair for more than a decade that I still use daily for detailed listening. The soundstage is absolutely incredible, as is the instrumental separation. For this price, just buy them.