Chris-Wang New Graduated Flexible Curve Drafting Ruler Flex Design Rule, Ideal for Engineering Drawing, Design Graphics, Garment, All kinds of Painting (50cm/20Inch) These flex curves are exceptionally flexible. They hold their shape and are easily adjustable. Graduated in inches and centimeters. The vinyl casing will not discolor or decompose with age. Two offset edges allow for precision ruling and the edges are raised for smudge free ink ruling. Package included: 1 x 50cm flex curve.