Some more from their specs...
While all Superide shocks are valved applicationspecific, the SS incorporates a unique digressive piston design that allows even more precise tuning. A special piston / valve assembly provides completely independent valving between compression and rebound cycles to increase reaction times regardless of vehicle speed.
Oil foam leads to shock fade. The SS virtually eliminates the possibility of foaming with a patented "floating" piston that divides the high-pressure Nitrogen gas and shock oil.
All components feature superior strength and tolerances that are typically associated with Aerospace technologies. The extruded body has a brushed exterior, finish plated in silver Zinc to withstand corrosive environments. The main shaft is solid induction hardened steel that is machined then precision ground and hard chromed for durability. Valve and piston components are machined - not stamped - and incorporate the highest quality seals. SS shocks also include premium rubber bushings and a black dust boot. This exceptional quality, combined with strict attention to detail, makes the Select Series the closest thing to a custom hand-built shock available today.