Cass Art Cotton Canvas is made from high-quality spruce wood and 100% pure cotton. This medium grain canvas has been produced for use with all forms of oil and acrylic colour, as well as many other mixed media applications. These canvases are also primed with three layers of gesso primer, FSC approved and acid-free. The canvas range in size and are 1.9cm / 0.75 inches deep. The canvas is heavyweight at 320gsm / 11.3oz.