EBC Bluestuff Front Brake Pads | 86-89 Mazda RX7 2.4 (1.3 Rotary)(Vented Rear Rotors)EBC Bluestuff pads which are made of high friction sport and race materials that can be used for aggressive street driving and certain types of track use. This material has had much success on the track with quality aftermarket calipers and multi piston systems with better release and cooling and larger rotors. The biggest advantage of the EBC Bluestuff NDX material is their bite from cold and progressive brake feel. Worlds first street and true track