9.5mm Technora sheathed ropes with toothed devices in Dual Main systems.
I purchased a pair of Petzl TibLoc “Ultra-light emergency ascenders” in 1999 when I was working as a climbing instructor. I liked the idea of a simple rope-grab that was compact and thus maximised the very short
We have had a good selection of 8mm nylon accessory cord for decades however these cords have never been seriously considered to be ‘ropes’ for technical rescue because they have had serious limitations in strength and abrasion