Nontoxic color blocks that never dry out! Avoid wasting paint and accidentally mixing colors together. Just moisten with your brush and use as a strong opaque color or as watercolor washes. Each block measures 2-1/4 in. dia. x 11/16 in. thick and contains about 4 oz. of paint. Nontoxic. Contains one each of black, blue, green, crimson, white, and yellow in a heavy-duty palette tray.