The first flexible magnetic audio disc. It could be folded along the dashed lines and mailed in an envelope. The Brush company had manufacturered wire recorders during WW and developed the Mail-A-Voice for the consumer market, before focusing their attention on tape recording. Disks and machines were relatively inexpensive. They were easier to use than wire recorders. Loading a disk was similar to putting a record on, which most people were familiar with. Mail-a-Voice was designed as a consumer product for the home and turned out not to be robust enough for office dictation.

The disks were manufactured by Shellmar, the same company that made the paper tape for the Soundmirror. Up until then, Shellmar had made paper wrappers for bread.