I just stumbled across this vid this morning, So far I havent found much info on them. Here is a snip-it I did find.

At only about an inch or two long and weighing in at 0.5 to 0.7 oz (13–19 g) they are possibly the world’s smallest rodent. They’re found in Pakistan and Afghanistan, and parts of China and Kazakhstan.

The species may have retained its unique size and look from the time it separated from a greater rodent family eight million years ago, according to scientists.