Make your own tool tethers...
The 4mm cord is the thinnest in the Beal range that falls under UIAA and EN stadards requirements, still not rated for life support, but it is rated and conforming with relevant standards. 100% nylon cord, made in France.
Sold in 120mt rolls only.
Colours: Yellow (blue/red fleck), Grey (Orange/yellow fleck), Purple (Yellow/Orange fleck)
Weight: 11 grams p/mt
Breaking Load: 400 daN (~kgs)
Knotted Strength: 530 daN (~kgs)
Standards: EN564, CE, UIAA