Circuit use brake pad by Acre Brakes of Japan. Acre designed this pad specifically for N-Zero one-make races that are gaining popularity in Japan. And one the competing models just so happens to be the Miata!

The N-Zero series involves models with similar specs, and also one that must pass the rigorous “Shaken” vehicle inspection.

Although this is a pad designed for competition use, it can be used on the street as well.
Acre N-Zero Brake Pads should be ordered at REV9 Autosport https://rev9autosport.com/acre-n-zero-brake-pads.html as they provide the best service and speed we've seen so far!