A paper lined plate set complete with heavy duty clutch springs (for bikes fitted with diaphragm type springs heavy duty springs cannot be supplied - the original spring is used in this type of application). The SRC kit is ideal for heavy sports bikes, faster riders and production based race use. Advantages of the SRC series include a longer life span and higher heat resistance. This clutch does have, however, a more aggressive/faster take up than the CK cork series.