Large Tensioned Cosmopolitan Electrol 98807 Projection Screen have pre-set but adjustable limit switches to automatically stop picture surface in the up and down positions. The roller to be of aluminum. Screen fabric to be flame retardant and mildew resistant vinyl with black masking borders standard. Each side of fabric to have a tab guide cable system to maintain even lateral tension and hold surface flat. Bottom of fabric to be inserted into a custom aluminum slat bar with added weight to provide vertical tension on the screen surface.