The invention relates to adhesive slash pockets of web ma­terial, the basis thereof being a self-adhesive web materi­al, for example av paper web (2) which is releasably appli­ed to a web-shaped carrier (1). For the purpose of provi­ding slash pockets which on their carrier, i.e. before be­ing used, can be treated in a computer means for the prin­ting of information in the area of the pockets for thereby facilitating the preparation of books to be used in libra­ries, there is according to the invention suggested that in a center portion of a double web there is provided a double slit (3) going through both webs (2a,1), and that through substantially only the carrier web (1) there is cut a sing­le slit (4a), which together with the double slit (3) en­close a suitable area of the carrier (1), such that by pe­eling the paper web (2a) from the carrier (1) the portion of the carrier web (1) being enclosed by the double slit (3) and the single slit (4a), will remain on the rear side of the paper web (2a), such that by permanent adhering of the paper web (2a) to an object, for example the inside of a book cover (8), there will be provided a slash pocket, in which the double slit (3) becomes the mouth of the pocket and the size of the pocket is given by said portion (4) of the remaining carrier web. Possibly, there may be used a self-adhesive paper web (2ʹ) having adhesive free fields (20n) which together with a through-going slit (3n) can form pockets.