Material Vinyl Decal Reusable; peel off and erase the text and then use again
DON'T apply to Textured  Rough and Uneven Wall Surface  which will weaken the adhesive strength..
17.7-inch(Width) by 78.7-inch(Length) /roll  comes with FREE 5 regular chalks.
Use chalks or standard chalk ink pen to write and damp cloth to clean.
Quirk Self-Adhesive Wall Sticker Black Board that provides a place to doodle  paint and experiment with stickers. With this artistic canvas you can almost do anything as long as you have an idea.