J-card
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A J-card is a paper in a audio cassette case or sometimes with Blu-ray and DVD cases. It has the album's picture, song list, who made it, and copyright info. Some J-cards fold out to show words of the songs, notes, or more pictures. The J-card has the name on its side, so you can see what it is when you look at it on a shelf.
The name "J-card" is because it looks like the letter "J" when you fold it and put it in the cassette case.
People also use "J-card" for the paper covers of CD-Rs. In the 1990s, CDs, mainly single-song CDs, had J-cards. This style is still used today.