English to Turkish Tech/Engineering Paper / Paper Manufacturing

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Aşağıda "Nobo Internal Glazed Case Fabric" ifadesinde geçen "case" tam olarak nedir?

Nobo Internal Glazed Case Fabric
If you need to protect important notices, these cases are an ideal choice.
Suitable for inside and outside use, they feature a 4 mm glass front and lock with a key - perfect for safety and security.
Internal glaze.
Fabric.
Smart, modern design provides both protection and security for your important documents
Flexible - hard-wearing cork for use with pins, or white magnetic steel interior for use with magnets and dry-wipe marker pens
1 cm border around each A4 page allows documents to really stand out