ARTEZA Acrylic Quilters Ruler & Non Slip Rings - Double-Colored Grid Lines (4.5"X4.5", 6"X6", 9.5"X9.5", 12.5"X12.5", Set of 4) Quilting patchwork ruler set of 4 measures: 4.5 x 4.5, 6 x 6, 9.5 x 9.5, 12.5 x 12.5 Patented double-colored design grid lines for clarity on light & dark fabrics Precise grid with  inch seam allowances Ambidextrous angle system ensures an accurate cut with both left and right hand Made from laser cut acrylic and designed for quilting, sewing, and crafts