Those are the DBA kangaroo paw brake rotors from Australia, looks like the top of the line 5000XS series shown there. They are excellent rotors. Their design dramatically increases the cooling surface area so they should run a little cooler. The colored stripes you see are temperature sensitive paint that will change color so you know how hot the rotor at the end of a session.
They don't have a 370Z application yet unfortunately. But for comparison these rotors for a 350Z were about $800 for front only. But they do have some cheaper models for those that aren't into *alls out racing.
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