my first kingsnakes

i just got my pair of kingsnakes
http://i1206.photobucket.com/albums/...ikingsnake.jpg
female 112 grams
http://i1206.photobucket.com/albums/...gsnakemale.jpg
male 129 grams

can i feed these guy very small rats or do i have to feed small mice?

In my personal opinion id go with mice.

any reason why mice are better?

Your babies are beautiful!!!!! As to your question, they look pretty small and may be to tiny to handle rats of any size at this point. My baby kings eat mice pinks and they are fine. (Sorry for speaking for whoever suggested mice)

How big are they? The weights don't tell me too much.

Well if you want your Kings to get huge start them on rat pups (at the appropriate size) but as wizard said we cant really recommend much since we can't tell their size foreal. In my opinion it looks like they could down a rat pup but id have to know their exact size to tell you for sure.