It's about as thick around as he is, and he slammed it down within 20 minutes. I would have liked to get him started on something smaller, but it's not economical in my area. I can't find any local providers who do weanlings-- That's a "small rat" from Arctic Mice, Reptile Industries. In other words, the smallest rat I can find without buying bulk, which just isn't feasible for me, as I hope for him to get much bigger before I'd use up all 50. This was the smaller of the two in my pack, and I'll probably put him on a 10-day schedule, just to be safe.