They use an organic friction disc to retain drive-ability similar to standard

INSTALLATION MANUALS2

Crossmember supports

Ford Focus ST/XR5 2

An external switch can also be used to change between boost groups if required

Clutch Kit - Xtreme Performance Heavy Duty Sprung Ceramic 430Nm 800kg (60% inc.) KNI23019-1B Xtreme Motorsport They use an organic frictionXtreme Performance sprung ceramic kit 1B Recommended for: Motorsport ApplicationsThese kits are available with sprung ceramic friction discs and are designed for motorsport applications where higher heat and torque capacity is required. These can also be used in some road applications. Specifications: Torque capacity 430Nm Clamp load 800kg 60% Increased over standard Sprung Ceramic Friction Disc Heavy Duty Pressure Plate Kit contains everything you