Art Advantage Artist Canvases are triple primed with acid free acrylic primer. They have a medium texture and uniform weave that readily accepts oils, acrylics, and alkyds paints. 100% natural cotton canvas is pre-stretched over 3/4 x 1 1/2 inch paulownia stretcher bars. Canvases are stapled on the back so that the artist can include the canvas sides in the artwork, thus alleviating the need for an expensive frame. 18 x 24 inch. Black.