The OmniEdge rulers feature a ⅛′′ removable lip that catches on cutting mats to prevent slipping. Highlighted outer edges reduce cutting errors when trimming ¼′′ 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.