Manufacturer: DBA (Disc Brakes Australia). Title: DBA Front 5000 Series T3 Brake Rotor – DBA52224V2BLKS. We use only the highest quality materials to ensure optimal performance under the most strenuous circumstances combining high carbon cast iron rings with aerospace grade aluminium hats (T6061-T6) held together with National Aerospace Standards (NAS) bolts and crimp nuts.