If you ever wanted a pair of headphones that sound great and aren't harmful for the environment, the AIAIAI TMA-2 Studio XE Headphones are a pair to consider. These headphones provide a great sound using using bio-friendly materials and minimal packaging. The ethos of these headphones is simple: AIAIAI doesn't want you to ever replace them; instead, you can upgrade them or re-outfit its parts as need be. Responsibility and modularity inform the entire design. Consider the 40mm bio-cellulose drivers, which are fashioned out of naturally occurring material. These drivers, paired with Neodymium magnets, deliver a 10 Hz to 40 kHz frequency response, and fantastic separation among instruments. The headband is fashioned out of PU leather. A detachable cable terminates in a 3.5mm TRS plug, and a 1/4" adapter is included.