Review on 🐜 RVGUARD RV Flying Insect Screen: 2 Pack Stainless Steel Bug Screen with Installation Tool and Silicone Rubber - Protect Furnace Vent from Pests! by Jack Ford

The mesh has the appearance of stainless steel, the base to which the mesh is attached is magnetic. It might be lower quality stainless steel, I'm not sure. The supplied silicone must be used. I haven't installed it yet, just run a neodymium magnet over it to see if it's rust free or not. Update: Installed and appears to be working as intended. The silicone is a bit long so you need to shorten it a bit. I've talked about it because if it shortens, it will be too short. So I just left the overlap of the hair.