Audio-Technica ATH-CK10 wired earphones. Only items shown in the photos. Functionality confirmed, plays without issue. No cable hardening. Rather, the cable is smooth and doesn't seem like it would harden easily. Recently, I acquired the Moondrop 50,000 yen line earphones, the SONY IER-M7, but honestly, I think it doesn't lose out to recent earphones in terms of high-frequency resolution and separation. However, it is quite high-frequency focused.