FLEXI DISC.
The flexi disc (also known as a phonosheet, Sonosheet or Soundsheet, a trademark) is a phonograph record made of a thin, flexible 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 Eva-tone Soundsheet in 1962, and were very popular among children and teenagers .
Undoubtedly the best example within the doo wop of this category of records is the Belmonts flexi picture disc made in Japan.
If you did not know it, below I present this beautiful work, a difficult piece to find and very expensive.
Click to enlarge.