1.magnet in the middle 2.close automatically 3.prevent mosquitoes,flies,insects going inside ... :prevent mosquitoes,flies, insects,ect.with magnet strip in the middle of the mesh door(window), it can be closed automatically ... doorframe3.material: polyster,polyester with cotton. 4.features:no frame and side, middle–open, no deformation and crease –resistant, saving resource, protecting environment ...