Just got this from Yale:
Hi Frans, thanks for the customer request.
The Yale Ultrex http://www.yalecordage.com/html/pdf/industrial_marine/high/Pg23.pdf
is made from Dyneema fiber and is a single braid so it’s easy to splice. Most common sizes for chipper winch line is 5/16 and 3/8. Standard color is Yellow.
5/16” – 13,500 lbs tensile
3/8” – 20,000 lbs tensile
I think Bishop has it in stock if you’re interested in a local vendor.
I can send you a small sample to the PO Box listed as well as a catalog.
It was nice to see you in Hartford. Call me if you need anything.