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The Super Damper uses an inertia ring of a given mass and elastomeric rings of a given stiffness and number to achieve the tuning to damp out the torsional whip. For more power and higher RPM use, the inertia ring is heavier than stock.
The Super Damper is superior to the OEM unit and is tuned to work at higher rpm. It is SFI, NHRA, IHRA and NASCAR approved.
In the past, reduced area slipper skirts meant light weight and low friction, but lots of noise and sometimes rapid wear to the piston, rings and cylinder walls. Not so with FSR pistons. JE has the piston design and barrel profile down and we have found FSR pistons to run quietly when we have used them, great for street engines.
The strut-type design also means minimal weight as there is no excess material around the piston pin, unlike fully skirted pistons. You can see some of the intricate under the ring land CNC machining here that removes all excess weight in low-stress areas identified by FEA.