These diaphragm style pressure plate and clutch disc sets are designed with a dual purpose in mind. The clutch disc is lined with two different compounds. One side gives smooth clutch engagement for ease of performance street driving, while the other side has a more aggressive compound and will withstand the abuse of competition. These clutches can increase the holding capacity as much as 90% over a stock clutch setup. The diaphragm design gives a nice, easy pedal feel without the need for typical clutch linkage reinforcing. Installs like a stock type unit without any modifications.