Spine?

Student or Learner
I need to know the English word for a part of book. It is not cover, not front or back cover but the "thing" between, which can be 10 mm wide or so... Help!
I need the information for a web page. A folder that is flat, and a folder that has a "thing" 5 mm wide, for instance.
Marjut
Spine?
Thanx!
Yep, Spine! That might be it!
Marjut
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