Is this too big for my ball python
Thank you for your question. You should not feed a prey item that is larger in circumference than the largest circumference of your snake. As long as your under this limit, you should be okay.
Here's a link to a ball python care sheet published by Reptiles Magazine that you may find helpful: http://www.reptilesmagazine.com/Care-Sheets/Snakes/Ball-Python/
I hope this answers your question, and thank you for contacting Ask an Expert.