These pre-stretched, double acrylic primed canvases are made of 100% cotton duck. They possess a uniform, medium texture. The canvases are acid-free, precision squared, and require no keys.The canvases are for use with oils, acrylics, and water-based paints. They are available with titanium white or light grey priming.Discovery Stretched Cotton Canvases are stapled on the sides and are 1.9cm . deep. Canvas sizes 60cm . x 90cm . and larger have a cross stretcher bar for additional support. Sold as PACK OF 4.