Specification :

ALL ABOUT THE WALLAPAPER
HOW I CHOOSE THE SIZE OF THE WALLPAPER
It's simple, you just need to click on the wallpaper you want on this page, then in the top part just below the visual in this page , you have a light grey table, type the size you want (cm or inch) in the field "HEIGHT" and "WIDTH", the prize is automaticaly update.
WARNING : You must put 5 cm more the size of your wall (on each side), it's a margin security.
Example : your wall is about 400 x 250 cm, the size you will have to put will be : 410x260 cm.