This extra plate set provides an additional 20% friction surface area, for less heat & increased grip in high performance applications. Comes as a set of 6 friction plates, made with Aramid friction material which is bonded to a 6061-T6 aluminum backing plate and 5 tempered steel drive plates. Steels come without stock style anti-rattle buffers that could fail. Complete with 10 Zero-Crush clutch springs. Can be run wet or dry. Upgrade replacement for 37850-68, 37930-68A (friction) and 37975-41 (2487-41) and 37975-81 (steel drive plates)