The Brembo GT front big brake kit for 2016 and later Mazda MX-5 (ND) applications pairs four-piston calipers with 328×28 mm cast two-piece rotors in a slotted Type-1 pattern and a black finish. The product description specifies rotor size and two-piece cast construction plus the slotted rotor treatment, matched to Brembo four-piston hardware for the MX-5 (ND) front axle.
Brembo 16+ Miata MX-5 (ND) Front GT BBK 4 Piston Cast 328x28 2pc Rotor Slotted Type-1-Black