File thingys

[Piglet]

OK, so I started building my cage today and I'm using lino instead of correx. I need something so that the pigs won't chew on it. You get these plastic things that you slip on to sheets of paper to make into a file. Does anybody know what I'm talking about? What is the specific name for them? Thanks.

 

[MommaCavy3160]

They're called Book Report spine's =0).