There wasn't any information, but it turned out this is a non-woven 'paste the wall' type of wallpaper. It was fairly easy to put up (we used ready-mixed wallpaper paste from Screwfix) even for us who are not into DIY, and had never hung wallpaper before. It was also very forgiving, and not very obvious even when the pattern matching is slightly off. 

Some of the blue lines came smudged, and also some of it seem to come off when wet. It was only a bit, and didn't bother us much. At this price, I think a bit of flaws is expected. 

The end result was dramatic! It totally transformed the kids' room, and we all loved it.