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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.
Raybestos ST45
Lower friction level than the ST-47. Slightly higher friction level than ST-43 while maintaining good rotor and pad wear. Could be used as a great rear to compliment the ST-47 compound.