Fredrix PRO Series Oil Primed Gallery Linen Canvases are made with the highest quality materials, using the best manufacturing techniques. PRO Series Oil Primed Canvases feature a medium textured, pure Belgian Linen primed specifically as an archival foundation for traditional and water mixable oils and alkyds. There is no need to prepare the canvas for oil painting as it is oil primed by hand, the old fashioned way. The stretcher bars are kiln dried and double reinforced, preventing the canvas from ever warping. Canvases are acid free, back stapled, and beautifully increase the depth, dimension, and longevity of your oil paintings!