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 - M340s $44.99 PSH Stoneware Clay - Dark Granite $59.99 Smooth Red Stoneware Clay $49.99 Plainsman Earthenware Clay - Snow $69.99 Laguna B-Mix with Grog Paper Clay $75.99