1.magnet in the middle 2.close automatically 3.prevent mosquitoes,flies,insects going inside 4.enviromental friendly,easy use 1.function:prevent mosquitoes,flies,and insects going inside , used widely in house,hotel,office,ect. nice look2.material for mesh polyester , polyester with cotton3. size:90*210cm and 100*220cm are very popularwe can make size as you need color: white ,black, grey, beige, ...