Large heat capacity, Max temperature can reach 1200℃; Excellent resistance to corrosion; Low wear rate as 0.00225； Noiseless, better for environment protection; All adopt C/C - SiC composites; Low density as 1.9，1/4 of metal composites，1/3 of resin composites, friction coefficient is around 0.4, Max can reach over 0.65.