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How they work: RPM shock pistons work better than any other RIC shock piston
Because they allow the shock to return to its static ride height at a much faster rate than do stock pistons. Our shock pistons act as miniature check valves (one way valves) that work instantaneously as the direction of the flow of oil through the piston changes. Consider all of the things that cause a shock to compress versus what causes it to rebound: With all R/C shocks, the shock spring is the only thing that returns the shock to normal, static height. Up until the invention of the RPM Two Stage Shock Pistons, suspension set-up has always been a compromise. If the vehicle were set-up for the big jumps, it usually wouldn't handle as well over the small stuff (suspension too stiff & bouncy), likewise, if the vehicle is set-up for the smaller stuff, the vehicle would usually bottoms out over the jumps (suspension too soft). RPM pistons allow normal dampening during the compression of the shock and increased oil flow on the rebound stroke for a quicker recovery with a normal, soft spring. This allows the suspension to stay planted and not over-compress or bounce. Regardless of piston choice, 30 - 4Owt. Oil is the best starting point. A variation in excess of  10 wt. Either up or down should be met with a piston change (next lighter dampening piston or next heavier dampening piston) to return your settings back to the 30 - 40 wt. Range.