Axxis ULT street pads pads (formerly called Axxis Ultimate) use a Kevlar and ceramic formula for enhanced performance. They produce maximum friction when cold, yet have tremendous fade resistance up to 932 degrees F. The coefficient of friction is high enough to produce a noticeable reduction in pedal effort. Fine for autocross or your first track event, assuming street tires and a low horsepower car. Not for track use on powerful cars or cars with R-compound tires.