For extremely high strength paired with low elongation and light weight, you can't do much better than the 5 mm Titan Cord from BlueWater Ropes. Make a loop with a triple fisherman's knot and keep on climbing - repetitive flexing won't wear on this abrasion- and cut-resistant rope crafted from a combination of Dyneema high performance fiber and nylon.
Bluewater Ropes Titan Cord 5mm x 6M
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A nylon sheath with nylon core accessory cord for a multitude of applications limited only by the imagination. CE and UIAA Certified., Available
8MM Accessory Cord
A nylon sheath with nylon core accessory cord for a multitude of applications limited only by the imagination. CE and UIAA Certified., Available
4mm Accessory Cord
Reelcraft L 3030 123 7Q - 12/3 30 ft. Premium Duty Quad Outlet Box Power Cord Reel
Canyoning –
BlueWater 7mm x 30 ft. Accessory Cord
BlueWater PreCut Accessory Cord 8mm
Cord management 30 ft 8mm Wrap
All –
Bluewater Accessory Cord - 4 mm x 30' (Yellow Mix) : Climbing Utility Cord : Sports & Outdoors