A metal-Dye hybrid window tint is designed for heat rejection and glare reduction. when they construct the film they will add aluminum to the material to get the heat rejection aspect to the tint. The amount of metal that is added is so small that it will not interfere with any radio reception or any type of cell phone disruption. Semi-metal films will have a charcoal look to the windows, they will not look chrome or metallic in any way. Our semi-metallic film comes standard with our lifetime scratch warranty, so you have a full warranty on any type of issue that may occur.