Which size of the Silent Spinner should I get for fancy mice?

You'll need the middle sized one marketed as a ';regular';. Its around 6';.





The small one is way too little for a fancy. My girls wouldn't use it. And the large one way too big. I have a mini/small one for my wild mice and it works for them. they are about 1/3 the size of the fancy mice though.Which size of the Silent Spinner should I get for fancy mice?
small.