DBA 5000 T3 Slotted Ring SINGLENOTE: DBA replacement rings are sold individually. Purchase quantity 2 for a pair. Sharing all the benefits of the 4000 Series, DBA's 5000 Series rotors are a composite 2 piece direct replacement brake rotor. DBA uses 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