Universal Canvas Twin Packs 16”x20” Double primed. 7 oz Medium texture.Twin packs of back stapled, pre-stretched canvas, for use with oil, acrylic and alkyd colors. Seven oz. cotton duck, medium grain surface with acid-free sizing and highly pigmented acrylic primers. Balanced absorbency prevents sinking of colors. Stretched by hand with tailored corners on kiln-dried, beveled stretch bars.