5000 SERIES T3 is the ultimate in direct replacement 2 piece performance brake rotors Featuring all the benefits of the 5000 Series along with DBA™s patented world renowned T3 bi directional slot design. Built on the foundations of DBA™s T2 slot, the T3 slot design features additional precise CNC machined tri symmetrical slots, resulting in an even quieter, more responsive and smoother braking experience. The T3 slot increases the number of exit points for brake pad friction dust and gases to escape through, further increasing the consistency and effectiveness of every brake stop. DBA recommends a T3 slot for high performance applications.