Blade geometry designed specifically for high compression ratio jet-pump systemsExclusive hub-end water seal keeps the nasty stuff out of precious partsImprove acceleration and top end while eliminating performance holesConstructed of ultra high-strength, corrosion-resistant stainless steelMirror-smooth finish and polished hub resists cavitationImpeller pitch is determined by casting, not bending.Lower pitch angle is recommended for stock motors higher pitch angle is recommended for modified motors lower pitch angle can also be used with modified motors if improved acceleration is desired.