Omnigrid Ruler. Made from durable premium quality acrylic plastic and laser cut for a smooth edge that allows for easier deeper cutting of fabric layers. This ruler was design for use with rotary cutters and straight edge blades. Use to cut strips, shapes and bias pieces. Includes 30, 45 and 60 degree angles with extra 1/2" for seam allowances. Ruler measures 24x3-1/2". Clear with black and yellow marking.