DBA DBA42028BLKXS Disc Brake Rotor. Surface Type: Drilled Slotted. DBA 650S T2 T-Slot Uni-Directional Slotted Front Disc Rotor For Scion FR-S NEW. DBA 42656XS-10 4000 Cross Drilled/Slotted Uni-Directional Rear Disc Rotor NEW.