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central groove from side to side of the ski on the back, plus two additional steel plates located internally.with the addition of a bottleneck and coverage throughout the length of the groove, which will act according to the principle of venturi tube.
central groove from side to side of the ski on the back, plus two additional steel plates located internally.with the addition of a bottleneck and coverage throughout the length of the groove, which will act according to the principle of venturi tube.