This is the flour mix/blend I use unless otherwise specified:

4.5 cups (495g) brown rice flour (see note)
1.5 cups (219g) potato starch
3/4 cup (81g) tapioca starch

I recommend using Authentic Foods superfine brown rice flour because the grind is smaller than a lot of other brands. You can find it on Amazon or here: http://www.authenticfoods.com/products/item/35/Superfine-Brown-Rice-Flour