The R18 is the pinnacle compound of the R-Series compounds engineered by G-LOC™.  R18 is based on the same successful principals and fundamentals that exist in all other G-LOC™ R-Series formulations. R18 has more initial bite, overall bite, and  even more controllable torque.  The R18 offers the absolute most linear torque curve we have ever created.  The thermal characteristics and coefficient of friction are of the highest offered by anyone in the braking industry .  This revolutionary compound will lead the way in all major forms of racing (professionally and grassroots).  R18 has a temperature range of 610°F to 2100°F+ (321°C to 1149°C+).  G-LOC™ does NOT recommended R20 for daily use on the street due to elevated levels of dust and noise and the amount of heat needed to work properly.