No, they're Korat, a breed from Thailand. It's one of the most ancient and pure breeds. It's a breed of a single color : grey. It is forbidden to cross with any other breed than another Korat. The Korat is called "the cat of good luck" in Thailand. It used to be offered to married people or important persons because it is supposed to bring good luck.
If you wish more information about the Korat, these websites are very good :