Well, I'm kind of frustrated. The small size was "too small". He'd eat one, then look around for another, and eat ravenously every two weeks. So I thought I was going to go up a little in size so he'd stop acting so starved. But the small-mediums Layne Labs sent were whoppers. To me, they look like mediums, period-no small at all, no size variation that I can tell. I kind of griped at the vet when I took my other snake in, and she told me it would make his head more in proportion to his body. (But this was the vet that gave a whole bunch of wrong advice and if I hadn't run it past people online, my other snake might have died from doing what she told me to do). At the time, to myself I'm like, "But he's a ball python. His head is supposed to be smaller than his body." But I couldn't find anything on the subject while researching so thought I'd throw it out there.