Koroda Invisible screen mesh is made of fiberglass. It is light in weight,tasteless, non slipping wire, flex, durable, allows good airflow. Good dimensional stability, moderate hardness, smooth, not easy to shrink and deform, good fixed position. · Durable and easy to clean, Allows good airflow. · Gray Net + Black Hook Loop, easy to work with due to it being pliable and easy to cut. · Meshes size:about 8 pcs meshes in 1cm. 20 x 20 meshes in 1 x 1inch area,which allows for clear visibility while still providing perfect protection. Package: the window screen is roll up or fold shipment(depending on area),so the crease is normal,doesn't affect the normal usage,when you open package,please tear it by hand,don't use scissors,In case of broke it. Note: If there are some creases, please don't worry, it would disappear after tile or hang the screen for a while. Due to space limitation, screen replacement is folded up in the package. It should be careful when you open the packaging, not to use scissors or sharp tools to prevent the yarn broken,hope you can understand. Warm Tips: · Keep window mesh far away from the flame. Wipe off the dust from the window frame before you install the mesh. · Wash it under 30 degree centigrade. Do not iron. · Make sure the window frame is cleaned completely to extend the lifetime of the velcro tape. · To avoid any damage on the screen mesh, please do not use scissors or sharp tools to open the package.