This 215mm 4 puck sprung center disc is for race use only.  It is more aggressive, faster on the straights due to increase grip and no slippage shifting.  The sprung center still softens the initial bite of engagement.  The four ceramic pucks are two different compounds.  The initial engagement face has slightly less bite to smooth out takeoff in first gear.  Click here to see our unsprung 4 puck disc .