These decals are great. They were really easy to apply and adjust if necessary...make sure your wall has been cleaned and dried off! It is really difficult to get them all applied evenly, so using painters tape as a guide is definitely helpful. But they look awesome! I got the large version for my one year old son and he learned all the letters of the alphabet very quickly...he loves looking at this together. it takes up a whole wall, which was what I was looking for...approximately 5 feet by 4 feet I would guess (have not measured). It stays stuck which is the most important thing. I haven't had any issues with them coming off whatsoever. Also these didn't have any obnoxious chemical smell like some decals do. Definitely a great colorful addition to our playroom!