The scale of the dimensions is-clear and does not become blurred as life increases. French curve, also known as snake ruler, curve ruler, one of the drawing tools, the ruler itself is-very soft and can be bent freely into any curve. Snake ruler can be arbitrarily shaped, will not rebound, and double sides can be used, metric and imperial double-sided use, convenient for you to-do different type of measurement. Measuring tape is-applicable to arc measurement, which is-used to bend to the radian and measure contour-lines. Ideal-for use in drafting, engineering, construction, surveying, dress making, craft and so on. Specifications: Material: PVC . Color: Black Note: Please allow 1-2cm errors due to manual measurement. Due to the-difference betweeen different monitors,the pic-may not reflect the actual color of the item. Package includes: 1x Curve Ruler