This is a 20 x 24" Sheet of Cinegel from Rosco. Rosco offers you many alternatives for various reflector surfaces or wherever control of reflected light is required. The nature of the reflected material can range from "hard" to "soft" - or from a gold tint to silver foil. Easy to use and cost-effective, these materials give you more creative freedom to achieve better tone and mood in your lighting.
The product designation generally indicates the quality of the reflection. Rosco's Cinegel swatchbook should be consulted for details.