Harkie Steel Core Flipline with swivel karabiner, 2 metre - Landmark Trading
Wire Core Flip Line Kits from Pelican Ropes - YouTube
Steel Core Flipline Kit, Adjustable Tree Lanyard, Climbing Positioning Rope, Low Stretch, Cut Resistant, for Fall Protection, Arborist, Tree Climbers, 1/2 inch x 8 feet : Amazon.co.uk: Sports & Outdoors
Treehog TH1170 Wire Core Flip Line - Radmore & Tucker