Winsor & Newton Professional Cotton Canvases have a traditional frame depth of 21mm / 0.82". They are made using a superior quality 480gsm 100% cotton canvas, giving the artist a high quality, long lasting painting surface.
The surface of the canvas has a medium texture and they are sized with an acid free primer, then double coated using a highly pigmented Titanium Dioxide gesso. This creates a surface that is ready to paint on with oil or acrylic paints.
Winsor & Newton Professional Canvases have the perfect tension (they will not sag in the middle). The larger sizes come with the Winsor & Newton innovative pro-stretcher™ device. This can be used in the corners of the frame at the back to tighten the tension of the canvas, if needed.
The professionally constructed wooden frames are made from kiln-dried solid pine and rigorously tested for warp-resistance.
These canvases are stapled at that back so you can't see the staples and all 4 sides of the canvas can be painted (cheaper canvases tend to be stapled around the edge of the frame, which you can see when hanging on the wall).
Winsor & Newton Professional Cotton Canvases are available in a range of popular imperial sizes and also come in a deep edge canvases, in metric sizes.