Up for your consideration is a Koss Pro 4s studio closed back headphone. This is one of Koss highest end headphones and was designed for studio usage. It sells new for 139.99. It includes a great lifetime warranty and is easily the best built modern Koss headphone. It is quite nice sounding for a closed back and offers a good amount of detail for its price point. I am selling it as I dont actually need a closed back headphone at the moment. I intended to use this as a night time headphone to not bother my sleeping family but I have found my Koss KPH30 works just fine in that role. I am the first owner and have only had it for a little over a month, most of the time it has sat in its case. I think I have only put around 25 hours on it or so. The box, carrying case and 6.3mm adapter are all included! This will be shipped from Japan using Japan Post E Packet service. This is a type of airmail that takes 5-7 business days to arrive to most of the world.