These flexible curves will mold to radii as small as 1/2" without kinking.
Each has a square lead core with spring steel on two sides to let you easily copy any curve. The spring steel sides keep curves smooth and help keep the curve in one plane so that it will lie flat for tracing.
These are "dead" curves that hold a shape well without spring-back. The vinyl covering has a slightly raised bead on one side for inking and a flat bead on the other for a pencil.
Each is an excellent tool for laying out smooth curves for tracing, or for copying existing curves such as the compound curve of a rocker.