Instahibit 100inches Diagonal 1:1 Manual Pull Down Projection Screen 70" x 70" Instahibit&trade; 100" diagonal 1:1 screen format offers 70"x70" viewing area Self-locked system provides variable height settings High contrast 1.3 gain let you enjoy clear and vivid picture Standard 4 black masking borders to get better image effect Matte white viewing surface diffuses projected light uniformly