ST-43 One of the best race compounds ever. The ST-43 brake pad has proven its capabilities in nearly every form of auto racing we can think of; lapping days in your street car, time attacks, club racing, rally, off-road, to the most severe race conditions. ST-43 always in all conditions. Easy on rotors and excellent life give you an unbeatable value in worldclass race material for any car. This pad is an excellent choice for being very user friendly and long lasting. It has been proven to wear long for many endurance racers.