Thanks for letting me share this Natalie!
4 1/4 c Rice Flour (658 g)
3 c Potato Starch (420 g)
2 c Tapioca Flour (258 g)
2/3 c Garbanzo Bean Flour (69 g)
1/4 c Xanthan Gum (38 g)
I actually double the recipe so I don't have to make the mix as often and store it in a container in the refrigerator.