Super dudes "Phineas and Ferb" invade your child"s room with this Phineas & Ferb wallpaper border in blue. Application is easy: simply dip each prepasted section into a bit of warm water, then apply to the wall. No muss/no fuss as the water activates the paste. Washable surface wipes clean with a damp cloth. Each strip is 5 feet long and 9" high.