The proto is a Bi-Directional Twin and the Heritage is a Direction Twin, however their techs are EXACTLY the same: Proto & Heritage: STS Pretensioned Fiberglass Bi-Lite Fiberglass NS SuperLight Wood Core CDS Damping System Sintered P-tex Sidewall Durasurf XT Sintered 5501 base Where as the SL has: STS Pretensioned Fiberglass BI-Lite Fiberglass NS Custom Flightcore

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NS Proto has the same tech as..?