Black CineFoil Aluminum Wrap is used to control and shape light. Helps to reduce spill light that leaks out on the side of barndoors.Clip to barndoor to further extend barndoors or flags.Cut holes in black wrap to create your own gobo patterns and shapes.Great for creating snoots and extending snoots or eggcrates.Rosco Blackwrap cinefoil is a "must have" in any lighting kit for film and video production.Matte black finish will not reflect light.Reusable.Roll measures 12" x 50ft.