ソノシート

noun

Sonosheet; sound sheet; flexible phonograph record

A thin, flexible vinyl record, often included as a supplement in magazines or books. The term comes from the brand name 'Sonosheet' but is used generically in Japanese.

• 昔むかしの雑ざっ誌しには、よくソノシートが付ついていた。

  Old magazines often came with a Sonosheet.