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I buy 11' of 8mm to make my tethers. Tie a figure 8 on a bight on one end and a stopper know (I like the barrel knot) on the other.
Lightweight and durable high-tech rope for tactical operations and rescue – used by saddle hunters for tethers, lineman ropes, and SRT/rappel rope. Sold by the foot, enter quantity as the number of…
doublesteps.com
For hitch cord my current favorite is the 5.5mm Beal Kevlar Cordette. Buy 4' and you can either make it a loop or double eye hitch cord.
Beal 5.5mm Kevlar cordelette – this is the same cord used to make Beal Jammy sewn prusiks. Polyamide sheath with Aramide core. This accessory cord is perfectly adapted for creating a prusik h…
doublesteps.com
Another option is 6mm TRC. Same thing, 4'
Sterling 6mm TRC – this is the recommended prusik cord for 8mm OpLux according to Sterling. Sold by the foot, enter quantity as the number of feet that you want and it will come in one continuous l…
doublesteps.com
Follow these videos for your knots: