Adjustable ship curve (24”) from Hoyle Engineering Co. Includes a tube case for storage and protection. Appears barely used, like new condition. Retails for $30-50+ online.

“These ACU-ARC Adjustable Curves are designed to peform similar tasks as the French curve and other rigid templetes.  The major difference is  that you can get the same shapes from just one or two of these ACU-ARC  Adjustable Curves instead of having to have an entire collection of those with an inflexible design. ACU-ARC  Adjustable Curves are made from between 10-14 layers of flexible,  shape-holding, interlocking strands of butyrate plastic. As the layers  slide past each other friction holds them in place.  So you can easily  shape them to match a series of plotted points, a template or pattern  you are following, or the image you have in your mind.”