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The Robertson SR-71 Tandem Zip Pulley is a cable pulley that represents the most advanced design work using state of the art engineering techniques to build the safest and finest trolley for the ropes course industry.

  • 304 stainless steel frame is .101 thick for superior strength and trouble free use
  • Assembled using machined 304 stainless axles which give unparalleled structural integrity
  • Additional back-up axle for safety, produces superior stability
  • Sheaves are 2" in diameter, case hardened to 56-58 Rockwell, and ride on sealed ball bearings to provide excellent wear characteristics in challenging outdoor environments
  • Built for 3/8" and 1/2" diameter cable

Item ID & DescriptionUnit SizeQuantity
Sr-71 Tandem Zip Line Trolley W/ Back Up1
Sr-71 Tandem Mini Trolley 1/2" Cable1