Extremely lightweight and very high strength. New England Ropes WR (Wire Rope Replacement) is perfect for replacing life lines and selected standing rigging on many types of boats.
WR is lighter, more flexible, and has a much longer service life than wire.

100% Dyneema double braid featuring SK-78 fiber
Coated with a proprietary urethane coating, it holds up very well in the marine environment
Resistant to UV degradation
Extremely low stretch
Does not absorb water
Easily tapered and spliced


Heavy on the technical side...

Dynema is the Dutch company DSM Dyneema's brand of UHMWPE (Ultra High Molecular Weight PolyEthylene fiber), a long chain, high strength, oriented strand, synthetic fiber with very high strength as well as high abrasion resistance.
This fiber is also known as HMPE (High Modulus PolyEthylene).
Dyneema is available in a number of formulations, SK-60, SK-75, SK-78, SK-90, etc. Each succeedingly stronger and more expensive.

Honeywell International produces a similar UHMWPE fiber, marketed as Spectra