Custom Case for WAZA-AIR and WAZA-AIR BASS Streamlined and rugged, the CB-WZ-AIR is the perfect partner for transporting and storing your Waza-Air or Waza-Air Bass wireless personal amp system. This custom case features a semi-rigid EVA shell and durable polyester exterior, plus a high-density foam insert with precise cutouts for securely holding the headphones, WL-T transmitter, and USB charging cable.