Powertrain Technology Twin Disc 4.5" clutch with two sets of discs 1 5/32"x26 spline
Used in a NA aspirated rotary race car.  Very light weight and low rotating mass.  Never had issues with using a synchronized T5 transmission and shifting at 9500.  If rotational mass were too great, the syncros would never been able to slow everything to make the clean shift.
www.powertraintech.com/collections/racing-clutch/products/4-5-racing-clutch?variant=32944935567500  
Selling due to moving to turbo application.  Clutch is rated for 450 ft-lb
Discs and clutch will interchange with Quartermaster bolt pattern 
Would not recommend using this for street application. - FLYWHEEL in photo not included
                    
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