Double roll: A double roll is one very long wallpaper roll, not 2 rolls like the name might imply. Most of our Traditional Wallpaper is sold by the double roll and is 24” wide by 27’ long (there are a few exceptions so refer to the item's description details).  Single roll: A single roll will be shorter in length than a double roll. Our Otomi Traditional Wallpaper is sold as a single roll.  Two roll set: When the repeat is so large that it takes 2 double rolls to complete the full pattern, the wallpaper will be sold as a set. Our Penelope wallpaper is sold as a set and is 2 double rolls, both 24" x 27'.