For those who require penetrating engagement and/or continue to break springs, the Competition Clutch Domestic Stage 5.5 – 0420 Four Puck Ceramic Rigid Clutch Kit is the direction you should consider. Similar to the 0620 six puck disc, but the 0420 is a rigid assembly without springs. This solid disc with ceramic buttons delivers a 120-250% increase in holding capacity and should be used only be the driver that requires instantaneous power. The solid high torque disc engages and disengages instantly. This should be considered a race only clutch and harsh engagement should be expected.