This is the SONY MDR-CD900ST, a classic monitor headphone. It's a standard model used for many years in professional recording environments such as Japanese music studios and broadcasting stations. With its faithful reproduction of the original sound, it's ideal for those who want to accurately check the sound balance during mixing and mastering. [Product Details] ・Usage: Used occasionally until a new pair of headphones was purchased. Mostly unused since then. ・Ear pads: Replaced once with non-original ear pads (soft and comfortable fit) ・Operation check: No sound issues on either side ・Appearance: Overall clean condition. There are minor scratches, but no noticeable damage or dirt. ・Accessories: Headphone unit only (no box or manual) [Recommended Points] ・Classic studio monitor model ・Ideal for DTM, home recording, mixing, and mastering ・Experience professional-quality sound at home Please purchase only if you understand that this is a used item. ⸻ #SONY #MDRCD900ST #MonitorHeadphones #StudioMonitor #Recording #DTM #MusicProduction #MonitorHeadphones #Mixing #Mastering #ProfessionalHeadphones