X-Type Tripod Projection screen Product Description It has two kinds of fabric to choice; 1. Glassfiber with 1.2 gain at 120° viewing angle, M1 non-flammability class. 2.Woven with 1.0 gain at 120° viewing angle 4 rods with spring system tension to hold the screen taut. The ultra light-weight tripod screen is height-adjustable. Slide: Aluminum tube is more firm, fiber tube is lighter. 3 size: 4:3 16:9 16:10 There are various specifications and sizes of projection screens according to their different uses, including those for household use, school use, KTV use, etc. The viewing distance is generally between three to five times the effective image height. The viewing distance also has a certain adaptation period: when first used, a distance of five times the screen height feels more comfortable, but in the future, a distance of three times the screen height will feel more shocking.