Whole Arts Frames is a leading manufacturer and supplier of whole canvas stretcher bars and stretcher frames for oil paintings. The best selling stretcher bars in the U.S. The stretcher bars are made of first quality precision-cut kiln dried fir wood. They have a uniform beaded edge as well as a molded lip, for easy assembly and a perfect painting support. The notched edges fit all brands that conform to the standard dimensions of 1-1/2 inch wide and 3/4 inch deep. (the most common size in the world). We recommend use of our cross braces (middle bars) for strips over 30, to maintain frame strength. Corner braces are recommended for added stability when stretching sizes 36x48 and larger.