Bob ross products are manufactured with care, from the finest materials. They are individually evaluated for quality and performance so novices and experienced painters alike can achieve optimum results in the wet-on-wet painting technique. Bob ross gesso contains pure pigments formulated in a 100-percent acrylic polymer emulsion which when dry produces a smooth, flexible, flat finish on artwork surfaces. It is ideal for the Bob ross painting techniques with oil colors as well as other art media including acrylics, tempera, watercolors, ink, pencil, and more. This package contains one 473-milliliter bottle of gesso. Black conforms to ASTM D4236. Made in USA.