Stereo Headphone HD 540 Reference II Speaker-P Sennheiser | Radiomuseum
Super Thick Soft Memory Foam Ear Pads Cushion For Sennheiser Hd540 Hd 540 Series Headphones Perfect Quality, Not Cheap Version - Protective Sleeve - AliExpress
Flex, HD540 Gold 600ohm. New favourite headphone. : r/headphones