Danny,

Amel used Kevlar 10mm on the SM. It is nearly impossible to find.

Amel suggests 12mm Dyneema:

The issue was not with the strength because Dyneema line is stronger than Kevlar. The issue is that most rope manufacturers are taking fiber from the middle of the rope and 10mm isn't really 10mm anymore. I purchased some 10mm that I could squeeze with my fingers to 7mm. Look at the Anderson Line Tender. You will see that if you can squeeze 10mm to 7mm, the line will certainly slip.