Fredrix Pro Belgian Linen Pre-Stretched Canvas 18 in. x 24 in. each Pr-Stretched Canvas is considered the ultimate surface for oil painting and also among the most archival. Our professional-quality&#44; pre-stretched canvases feature the finest 5.5 oz. pure Belgian linen Primed with acid-free acrylic Titanium gesso to a finished weight of 11 oz. Our top of the line stretcher strips are kiln dried to prevent warping with extra bracing for added support