... is made of PP, PVC or PET film.2.Binding covers are used for the covers of menus, information books and ... worm corrosion with high transparency. Normal specification:NameSpecificationThickness(mm)Clear binding coverA4,A30.125, 0.15, 0.18, 0.20, ... 0.25Color binding coverA4,A30.125, 0.15, 0.18, 0.20, ... 0.25Matte binding coverA4,A30.125, 0.15, 0.18, 0.20, ...