This stretched cotton canvas is made from 8 oz. cotton duck, a heavier weight, superior quality cloth with medium grain surface. Triple coated with acid free sizing and two coats of highly pigmented acrylic primer, its balanced absorbency and tooth prevents sinking of oil colors and improves adhesion. Its frame has been specially constructed with kiln fired, beveled stretcher bars, and the canvas has been stretched by hand for best tension and tailored corners. The canvas is stapled on the back. The Artists? Canvas is ideal for use with oil (including water mixable), acrylic, and alkyd color, and for all techniques, including heavy paint applications. Canvases are 3/4 in. deep. Canvases 18 in. x 24 in. through 24 in. x 36 in. have one additional support bar. Canvases 28 in. x 36 in, through 30 in. x 48 in. have two additional support bars. Canvases 36 in. x 48 in. and larger have three additional support bars.