The closest standard material I can think of is the Stewart Filmscreen Lumiflex 50/50, which allows simultaneous front and rear
screen viewing from a single
projector, although is requires a very bright
projector, is susceptible to ambient light and has the potential issue of one side being front projection and the other side rear projection, thus the images are inverted from one another and text is a real problem. You could always contact Stewart Filmscreen, Hurley
Screen, Harkness
Hall, Da-Lite,
Draper,
etc. and ask them, it would probably be a custom material and very dependent upon whether the manufacturing process allows a finish to be applied to both sides of the substrate and whether that would be a problem in regards to the
screen rolling up. Another factor for an
arena would likely be how large a motorized
screen is possible. In the end, it might be easier and less expensive to just use two separate screens mounted back to back with a common low
voltage control.