From what ive just read up on if they have a white and red dot they are ef-s compatible. Red dot only is ef only. Ive just checked mine and they have a white and red dot unfortunately i dont have any ef-s lenses to check for you sorry.
will have a look a bit deeper in to it.Apparently the newer Kenko ones are Ef and efs compatible.
What is not EF-S compatible? To the body or to the lens? Does that question make sense?
I ask because I have used my Kenko's on my 50D, 7D and 5D2. I have however only used them with EF lens's.