The OmniEdge rulers feature a 1⁄8″ removable lip that catches on cutting mats to prevent slipping. Highlighted outer edges reduce cutting errors when trimming 1⁄4″ seam allowances. Ideal for cutting straight and bias pieces. Includes 45° and 60° angle lines. Made of strong and durable premium quality acrylic plastic. Laser cut to within 0.002″ accuracy with a smooth finish.