Authentic mod from The Boss Mod in the Phillipines. All copper mods with the exception of the brass top and bottom caps. Dual adjustable copper 510 pin to flush mount your atty and eliminate battery rattle. Copper firing pin and magnets direct from the manufacturer. Great ventilation through the bottom cap and some through the topcap. Quality built mechanical mod to please the hardcore copper lover. Black Vertex has a pvc coating over the copper.