Here's what other sites are saying:
Tunnel Vision is this bizarre 5. 7 down in Red Rock Canyon where you climb into one side of a cave and out the other. As uniquely fun as it is, it's really nice to have one or two of Edelrid's Tubular Sling 16mm to extend your placements and reduce rope drag in there. Otherwise you'll be too busy pulling up the rope to actually enjoy the unique position you find yourself in.
Edelrid Climb Tubular Sling 16mm Slate/Oasis 60cm 715650606270. Features/Specifications: 16 mm sewn sling made of robust and abrasion-resistant polyamide. Width [mm]: 1600 Load capacity [Kn]: 23 CE marking: CE 1019