These boxes/covers have a heavy-duty metallic plate that protects both the box and wiring. What does that mean for you? It means your risk of re-work is dramatically reduced. Oh, and by the way, our PVC Electrical Boxes are made to last, with polycarbonate material to withstand extreme temperatures and PVC construction for durable performance. Some are suitable for fixture support up to 50 pounds. All install like a breeze.