Actually the material(the same cloth used for covering car audio sub boxes) that appears to be masking is just for aesthetics to cover the wooden screen frame. I do employ a more primitive masking system using a couple of 7" x 87" strips of thin wood paneling that was painted matte black and covered on the outer surface with the same black felt cloth. It's held in place by Velcro and a couple of screws. So it's a real pain to install and I rarely use it. I would love to have a Stewart 2:35 screen with side masking and an anamorphic lens but my room is just to small.