1. Our rollup shade is made from durable fabric and has a very robust hanging system. The fabric is soft to the touch, and edges are cut to a sealed edge that prevents fraying; ergonomic and userfriendly pom pulldown handles; does not easily collect dust. 2. Note: the width measurement for the roller mechanism. 3. Internal installation: measure the height, width, and depth of the window. The depth is at least 2.8 inches. For the inner bracket, the blind width must be at least 1/4 inch less than the window width. There will be a tiny gap on each side, so that the fabric width is at least 1.5 inches smaller. In other words, the fabric width is 1.5 inches smaller than the roll mechanism. 4. External mounting: lower requirements than internal mounting. Roller blind width must be 78 inches wider than the window width to avoid gaps. The scooter tones length must be at least 7 inches longer than the window length to ensure that the entire window is covered.