Store › Plainsman Stoneware Clay - M390 Plainsman Stoneware Clay - M390 $49.99 Very plastic high iron clay body. Smooth in texture, it is the darkest firing of the medium temperature red bodies. Very plastic high iron clay body. Smooth in texture, it is the darkest firing of the medium temperature red bodies. Add To Cart Added! You Might Also Like Plainsman Stoneware Clay - M370 $69.99 Plainsman Stoneware Clay - Coffee $74.99 Plainsman Earthenware Clay - Snow $69.99 Mid Cal Grogless Stoneware Clay $49.99 Plainsman Stoneware Clay - M340 $44.99