Fiberglass matt white viewing surface Ideal for overhead projectors and high light output projection devices Gain of 1.0 and a viewing cone of 180 Pentagonal steel case and endcaps Operates instantly at the touch of a button and stops automatically in the up and down positions Non-tensioned trap door and 2 inch masking above viewing area Fiberglass matte white viewing surface Ideal for overhead projectors and high light output projection devices Gain of 1.0 and a viewing cone of 180 Pentagonal....