From the Manufacturer:
Pacific Arc Template Guides are the ideal tools to make exact specifications for geometry, drawings, plans, and sketches.
- Assorted templates for all purposes such as landscaping, architecture, plumbing, lettering, electrical, and circles.
- Made of strong translucent green plastic.
- Works on many surfaces including paper, vellum, fabric, canvas, wood, and mylar.
- Will not obscure the surface you are working on.