I recently received some restaurant quality Tramontina cookware, but I can't seem to find info. on the specific pieces I have. There are 4, tri-ply clad, 18/10, 16cm pans with two riveted handles and 3, tri-ply clad, 18/10, 20cm pans with two riveted handles. All are magnetic induction and were made in Brazil. What are the advantages of tri-ply clad cookware? I plan on using it on a gas cooktop. Can I do that, even though it is magnetic induction? Also, is this considered high-end cookware and is it non-stick? I don't even know the cost of my pieces (no lids). Any info you can offer would be greatly appreciated.