Beyerdynamic T90 headphones. Equipped with Tesla drivers, the T90 is positioned above the DT990 Pro in terms of grade, and likely slightly below the DT1990, which also features Tesla drivers (I think). All original box accessories are included. Sound output is not an issue. The ear pads are relatively clean. The headphone case has deteriorated, with hydrolysis occurring at each corner. The headband, known for its tendency to deteriorate, has been replaced. The original is quite stiff, so I've replaced it with a softer one from another manufacturer. The replacement headband has been hardly used, so it's in good condition. I will also provide the original headband if you want it (though it's crumbling and shedding black debris due to hydrolysis). I am also listing this item elsewhere (at a slightly lower price), so the first sale will take precedence. Thank you.