Ingredients of a Neo game. For a report Im doing

I know this is kinda a dumb question, but I'm doing a report TOMORROW basically on the stuff it takes to make a game cartridge. I think the plastic casing of the game is polypropylene.Or is it polystyrene? I've been finding info for about a week now, but I still need a lot more.
Also, the old style box for neo geo games kinda smells like leather ( not the snape case or the paper one ). Anyone know what it's made out of? So if you could help me out, or tell me a place to go where I can get this info, I would REALLY appriciate it!

Thanks!
Gunbu

I think the old style case is made out of regular plastic. Although its soft like leather it is plastic or pvc.