The non-slip ruler for quilting, sewing and crafts. Right & left-hand numbering and angle system with 30°, 45° and 60° angle markings. For cutting strips, borders and biases, cutting angles and multiples of angles and cutting across strata (strips of fabric sewn together with 1⁄4″ seam allowance). For use with rotary cutters and straight edge blades. Transparent, neon green double-sight lines that seem to glow on both light and dark fabrics.. Non-slip backing.