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Raybestos ST42
Lower mu than ST-41 and ST-43. Extremely stable average and in stop output over a wide temperature range. Has been very successful when used on the rear brakes in conjunction with the ST41 on the front. Best high-temperature wear of all their materials.
Raybestos ST43
Excellent wear rate on rotors and pads. Friction level between ST-47 and ST-42. This is the most popular compound for HPDE, Open Track and Endurance racing.