4000 Series T3 Slotted Brake Disc Rear 4000 Series T3 Brake Rotor DBA 01-05 MX-5 Miata Sport Suspension / 04-05 w/ MazdaSpeed Turbo Rear Slotted 4000 Series Rotor Brake Rotor Brake Disc Cast from XG-150 high carbon alloyed iron and undergoing Thermal Stability Profiling. DBA's metallurgy is able to handle the increased stress and heat generated under intense braking application time and time again. Featuring DBA;s patented Kangaroo Paw ventilation that implements a series of 144 diamond and teardrop patterned pillars. DBA achieves up to a 30% increase in surface are and 20% improvement in cooling efficiency compared to traditional straight vane design. 4000 SERIES T3 is the ultimate in direct replacement single piece performance brake rotors Featuring all the benefits of the 4000 Series plus DBA?s patented world renowned T3 bi directional slot design. Disc Brakes Australia Brake Disc DBA 4000 Series T3 Brake Rotor Disc Brake Rotor