This 60x84 size is in the 7:5 Aspect Ratio. Medium weight Belgian Linen - primed weight: 13 oz.. It's sized and primed with an archival quality oil primer, impervious to paints leaching through that harm the fabric. For oils or alkyds only. It's highly absorbent and has excellent qualities of luminosity. It has a warm yellowish hue and is an extraordinary painting surface! Linen is strong and it's natural oils keep it flexible and prevents disintegration. The surface has a smoother tooth, although, not portrait. There is a 1/2" gap between the canvas and frame. We never use finger joints in our wood frames which are known to fall-apart over time and under the tension of a stretched canvas. Our 3.25" wide heavy-duty keyable cross braces allow the canvas frame to be tensioned in the middle, where the tension is needed the most...a unique design for which we earned a patent! The corners have increased rigidity due to the DIAGONAL STEEL BRACE SUPPORTS. This frame uses even larger 2.25" wide Stretcher Bars for superior strength. Cross braces are glued and fastened at the “cross” for maximum support and rigidity. Both corner keys and brace keys are pre-installed. Stretched using our proprietary MuseumWrap method, producing a drum-tight-stretch up to 50% tighter than other methods, and with balanced tension across the surface. The corners are uncut and neatly folded, making it possible to remove and re-stretch the canvas on the same size frame.