This is a Heavy Duty "Street/Strip" full-face, sprung hub, organic lined clutch disc for non-turbo (NA) Mazda RX-7s from 1979-1982. Among other things, the disc has no Marcel, so the engagement and disengagement is faster and less taxing to the synchros. Much more precise feel. Sprung hub is friendlier to the driveline. Highly recommended for street performance and light track use.