1.These blackboard sticker are really easy to apply on walls， refrigerators or kitchen cabinets.2.Some wall paints are designed to resist stickers， please check before purchasing.3.It's recommended to clean the wall leaving no dust and dirt before applying the stickers onto your wall4.We strongly suggest having 2 persons to apply the stickers5.Please don't use it on freshly painted walls，Place on a smooth flat surface such as walls or windows etc6.Material: Vinyl Color: Black7.Water proof8.Size: 200cm x 45cm (The size is one-sheet without any design)Package Includes:1 pc 45x200cm (17.7"x78.7") Blackboard Removable Vinyl Wall Sticker Chalk Board