According to the company, it is a bond-in solution that flexes and conforms to fit to a conical surface. The company says that high carbon is a carbon impregnated friction material able to withstand very high temperatures. Raybestos recommends high carbon as a replacement for PWM controlled systems and as an alternative in continuous slip applications.
The dimensions are 12.110 by 10.750 by .045, and the part number is R445000HC. It is made for 10R80 applications, model years 2017 and on.