Marlow D12 Max SK99 is a single braid Dyneema.
See supplier info at: https://www.marlowropes.com/product/d12-max-99-grand-prix-rope

SkiffRopes use D12 Max SK99 for:
- forestays and sidestays
- strops and cascades
- control line purchase systems.
SkiffRopes stock:
- 2.5mm for $6.5/m
- 3mm for $7.5/m
- 4mm for $12/m (currently very low stock)
- 5mm for $14/m.