[GOOD MATERIAL & ZIPPERS DESIGN] It's made of fused fiberglass and about 16 grids per inch; long lasting also keeping bugs out & let fresh air in; Double zippers easy to open or close your ; [WIDLY USED]The screen is soft, it's suitable for narrow or uneven frame. Screen is sticked around, so the tightness is normal one. [EASY INSTALLATION]Hook straps are sitcked on the frame or wall; Screen is sandwiched between hook&loop ;Because hooks can pass through the tiny holes of screen, connecting to the loop after pressing hard on the loop .then cut off no-required screen; Recommend watching video tutorial for more information [SIZE]47 X47 inch(120cm X 120cm)with zipper opening, it can be cut to fit window size(include frame) smaller than 47X47inch,DIY your size as you wish, all you need is preparing a scissors,no drilling,Insect Protection Nets for Household Purposes [EASY TO SAVE & REUSABLE] Just peal the screen off and fold it well (better to keep hook straps still there);It can be washed by hands(not machine).