SPEC Clutch Stage 3 Kits Feature a carbon semi-metallic 6 or 4 (application dependent) puck sprung or solid hub disc that has been the leading puck clutch in drivability, life and torque capacity. This unit is designed for street and race cars that require an aggressive but streetable engagement and high torque capacity. The sprung hub (application dependent) version is double sprung with spring cover relieves for flexibility and heat treated components for strength and durability. Also available in 3 puck configuration. Great for street, drag, road racing, pulling, rallye and drift. Some applications require a solid hub based on the vehicles flywheel setup.