Ported Lower Manifold @Synergy Composites

Boss_302

So here's a question on lower intake manifold gaskets, Since I never R&R a 370z intake.
The gasket's that I received from Nissan Parts over the net. came as 3 metal gaskets together riveted at the bottom. So is this a composite metal gasket? What I thought I was purchasing was a gasket set like every other normal V-8 I've worked on.
Can someone please enlighten me before I take this apart.