The flexi disc (also known as a phonosheet or sonosheet) is a phonograph record made of a thin vinyl sheet with a molded-in spiral stylus groove, and is designed to be playable on a normal phonograph turntable. Flexible records were commercially introduced as the Evatone Soundsheet in 1960, but were previously available in the Soviet Union as roentgenizdat or bones, underground recordings on x-ray plates.
Before the advent of the compact disc, flexi discs were sometimes used as a means to include sound with printed material such as magazines and music instruction books. A flexi disc could be molded with speech or music and bound into the text with a perforated seam, at very little cost and without any requirement for a hard binding.