These acrylic light diffusers were used on brass color light fixtures under shelves or overhead cabinets in late 1950's and early 1960's Airstream trailers.
The fixtures are no longer available but if you have them in your trailer you can save the fixture and preserve the period look of your trailer by replacing the diffuser with these reproduction diffusers.
The material comes in standard 48" lengths. You will cut the four foot length to the desired length for your fixture.
Available in smooth white or prismatic options.