Yes it is big enough for switching to some size of rat. We start our balls out on rats as soon as we get them if they will go for them. 60 gram ball can eat a baby rat pinky. If we get a 50 or 40 gram one we give it new born naked rat babies. Naked rats tend to be a little smaller than regular rats and the babies tend to be smaller as well if they are pure bred naked rats.

The big question is will it change over?