Below is a general manufacturer product group description. Please note the information below is not item specific. Item specifics are above in product details.

The Competition Clutch Stage 4 – Strip Series 1620 Clutch Kit, available with a double spring, six rivet carriage is good for ease of gear transition with higher horsepower. This disc complimented by a performance pressure plate provides 250% increase in torque capacity.
The 1620 Series kit includes a performance pressure plate, a six puck high torque sprung disc with Ceramic buttons, all applicable bearings, and the appropriate alignment tool.