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A spline, or the more modern term flexible curve, consists of a long strip fixed in position at a number of points that relaxes to form and hold a smooth curve passing through those points for the purpose of transferring that curve to another material.What are flexible curves made of?
A flexible curve is a controlled plastic curve which will easily bend down to a 25mm radius and will keep its shape. It is made of a washable plastic. It prevents slipping and it is invaluable for drawing.What is a flexible French curve?
A flexible curve ruler is not the same as a "French" curve, which has permanently shaped curves. The flexible curve can be shaped to any curve within a range permitted by the material it is made from. Most flexible drafting curves will not curve to a diameter below 2 inches (5 cm).