Zweigart Interlock Needlepoint Canvas in 40" bolt width. This is a lighter weight canvas than mono canvas. The warp and weft threads pierce each other, making the intersections a little less flexible than in mono canvas. This is a popular canvas for Bargello and other types of needlework with long stitches. Please note: A fat quarter is a rectangular piece of canvas, called a fat quarter because it is a yard of canvas cut into 4 equally "fat" pieces, each measuring 18" x 20".