AKG K121s Open Back Studio HeadphonesProduct Information Product Description Technical Specs The AKG K 121 Studio are entry level professional headphones for various applications, as Project Studios and Home Recording. These semi-open, supra-aural headphones are a true all-round performer. The AKG self-adjusting headband ensures good comfort. The K 121 Studio are equipped with a 3.5/6.3 mm stereo adapter and is designed for ambitious and rugged use. The leatherette ear pads are easy to clean. The K 121 Studio are designed and engineered in Austria. Features Semi-open design Supraaural Self-adjusting headband