sliding smoothly,saving outside and inside space,airtightness,sound&heat insulationg,waterproof,easy to use & install White color Aluminum frame American style mosquito net/flyscreen/insect screen for UPVC/PVC/Vinyl/Plastic/Aluminum windows and doorsExternal Characteristics:1.Features: white color, sliding smoothly, antiweatherability, heat-insulation, sound-proof,air permeability performance, ...