RacingLine Stage 2 330/345mm Replacement Rotors (2019) suit 4 piston caliper Kit- 330mmA bigger, 345mm x 30mm triple grove disc gives greater heat capacity, thus reducing the effect of fade. Cast Carbon disc material withstands high temperature stresses without excessive material expansion. DISC QUALITY Discs made from high cast carbon a mixture of high quality steel combined with carbon; giving a far higher friction coefficient compared to normal steel rotors. GROOVED & VENTED The 345mm x 30mm discs, with integral mounting bells, use