This 100% cotton, 7oz. Canvas uses a spline cord to secure the canvas on the back of the ¾” deep standard stretcher bar frame. This leaves the edges free of staples, so you can paint on the edges, and display artwork without framing. Like all Masterpiece canvases, Cezanne Artwarp is primed and sized with acid-free, pH-balanced titanium white acrylic gesso, ideal for use with acrylic, alkyd or oil paint. Sold singly.