Warm Audio Flight Case for WA-251Warm Audio Flight Case for WA 251 The WA 251 flight case provides safe housing for a WA 251 microphone system for travel or storage. Made out of aluminum for strength and low weight, the cases top lid is dressed in soft ribbed foam, while the main compartment features rubberized foam that is precisely molded to hold all of the components of the WA 251 microphone system safely and securely.