This brochure covers are unfortunately too thin. This in itself would not bother me but continued when the shells by not en masse (!) Would tear at the perforation (and this after only a few weeks use). This is an absolute "no-go" is for use in the folder which actually purpose is the thing. The specified in the description durability and hole edge reinforcement are to say the least a joke. Too bad, because otherwise the product for its price is quite ok.