Anchor or Whoopie Sling Tree Runner® Anchor Sling Anchoring or Whoopie Sling - adjustable. DoColor Web Rigging Sling 25 mm FTC Anaconda Rigging Sling DoColor Web Rigging Sling 30 mm FTC Viper+ Rigging Sling FTC O'Ring 2 rigging sling Teufelberger tREX Loopie Rigging Sling DoColor Web Rigging Sling 60 mm Teufelberger tREX Soft Eye Rigging Sling Courant AKA Rigging Ring Sling Courant AKA Rigging Sling