It’s a cassette! Well done if your guess was correct!

DID YOU KNOW?

a tape cassette/cassette tape/audio cassette/tape/cassette
A cassette was developed by the Dutch company Royal Philips in Hasselt, Belgium, by Lou Ottens and his team. It was introduced in September 1963. Compact Cassettes come in two forms, either already containing content as a prerecorded cassette (Musicassette), or as a fully recordable “blank” cassette.