Axxis Ultimate is a kevlar- and ceramic-strengthened compound which offers far and away the best price to performance ratio currently available in a high-performance street pad. Proper bedding procedure is critical to the performance of this pad, but once complete, you can expect truly world-class bite, MOT, minimal rotor and pad wear, and very low noise levels. Dust production is medium-to-high. On front-engine platforms, the Ultimate is excellent for aggressive street and autocross use in the front calipers. It also works very well in the rear, for applications ranging from aggressive street to moderate track use. Ultimate is NOT recommended for use on road courses in front calipers as this can cause uneven pad deposition on rotors as well as resultant vibration. Street and autocross use only. OK for club-level track use in rear calipers.