Coavas Multi-Purpose Chalkboard Contact Paper Wall Decals For Home Kitchen Children Room Wallpaper, Office,Restaurant Coffee Bar Menu Chalkboard 17.7-Inch by 78.7-Inch &iexcl; Benefit:Welfare-send five chalk. Household Use:Children graffiti,family message, write menu and holiday reminder. Office/Business Use:Conference record, work schedule,and all type shops can be used when promotional activities. Scope of application: smooth wall/glass/wooden board/wallpaper surface,not apply to gypsum wall. Made out of strong vinyl material for long lasting quality. Smooth writing and will not emit a strange sound.