Features: Flexible curve ruler made of PVC materials with built-in metal strips, soft and easy to bend for accurate measurement Scale markings are clear and remain legible over time French curve, also known as a snake ruler or flexible curve, is a drawing tool designed to be easily bent into various curved shapes The ruler can be shaped freely, holds its form without rebounding, and features dual-sided measurement scales in both metric and imperial units for versatile measuring needs Ideal for measuring arcs and contours by bending to match the desired curvature Suitable for use in drafting, engineering, construction, surveying, dressmaking, crafting, and other applications Specifications: Material: PVC Size: Approx 30/40/50/75/90cm (11.81/15.75/19.69/29.53/35.43 inches) Color: Black Note: Please allow 1-2cm error due to manual measurement Due to differences between monitor displays, the image may not reflect the actual color of the item Package includes: 1 x Curve Ruler