Format - 1:1 ,blank thickness - 0.3 mm ,Viewing degree - 120 ° ,gain factor 1.1 - times projection screen size ,Tubus length - 254.7 cm ,Width - 236cm ,Height - 236cm  ,Dimensions ,Width - 254.7cm ,Depth - 6.8cm, Mount permanently to wall or ceiling ,- Mount on an aluminium profile ,- Easy to unwind or rewind to the desired position