High quality fiberglass window screens with good light transmittance, extremely high durability and tear resistance, UV resistance, easy to clean and mold resistant. It even withstands pets such as cats or birds. Fly screen to protect against insects: Keeps flies, wasps, mosquitoes, moths and other unwelcome pests away. You can open windows at night for a good sleep and enjoy fresh air during the day. Enjoy a healthy, comfortable summer. Wide application: Suitable for replacing various door and window grilles. Quickly and easily covers basement well holes, saving time on cleaning, and is also suitable for gutters to prevent leaf ingress. Easy installation: DIY size. The fly screen is flexible and easy to cut with a knife or scissors. Either sew or glue a double layer of Velcro strips and attach the other side to the window frame, or insert into an existing or self-made tension frame or door. Applications (examples): - Ventilate bedrooms, living rooms, or kitchens while keeping insects out day and night. - Retrofit or replace door/window screens in homes or offices. - Cover basement window wells and gutters to block debris and pests.