You can choose between B-mix (white clay) and Navajo Wheel (red clay) when you get to the studio (or put your choice in comments below).  Clay is $1/lb and sold in 5 dollar incriments at the studio.

Recycled clay is also sometimes available, it is a mixture of the white and red clays.  Recycled clay costs .50 cents/lb so, for $5, you get 10 lbs!  Recycled clay may vary in color and consistency- use at your own risk!