Yaheetech 70" Tripod Portable Projector Projection Screen 49x49 Foldable Stand Material: iron, PVC; Screen size: Approx.49.2" x 49.2" 4-side black masking borders increase picture focus & contrast and provide a sharp and clear picture High contrast 1.3 gain screens optimizes picture quality Aspect Ratio: 1:1; Gain: 1.3 Diagonal: 70'' Viewing angle: 160 degree Viewing area: 49''*49''