We call it Index P7005
Sometimes in general people call the product as notes or just a paper that people use to write something, but this product is a little different than others, we call it Index P7005 or as known as Clear Colour PP Divider, so in means the paper that have a divider in it, in simple way yes but this product for have special thing that just some other notes have, this product on the front cover is made by PP sheet additional.
In specific way, according to wikipedia, Polypropylene (PP) is a thermoplastic "addition polymer" made from a combination of propylene monomers. It is used in a variety of applications to include packaging for consumer products, plastic components for various industries including the automotive industry, special devices such as living hinges, and textiles. when book cover with paper material get crumpled because of water or being stacked up of other books or other item, it will be more better condition than usual, because PP sheet aditional is made of thin plastic material that can protect the cover from water and light folds without leaving a trace.