This is a full gasket set for the 2004-09 GM 6.0L V8 Vortec 6000 Engine. The set includes a head gasket, intake manifold gasket, exhaust manifold gasket, valve cover gasket, and other gaskets necessary for a complete engine rebuild. The gaskets are made of metal and are manufactured by LOFTMARTE. The product is not modified and does not contain any non-domestic components.