I spoke with one of the technical experts at Sterling today. They recommended 6mm TRC for friction hitches on the OpLux. I know that's been mentioned on the forum before, not sure about this specific thread. I already switched my tether and LB over to the OpLux, no plans of going back. I'd rather run an untended prusik on both if that was the only option (like the beal jammy) than go to a much larger rope or mechanical option. The bulk savings is impressive.