Why not Spectra ?

[osteoderm]

Jak,

Chafe is a major issue with bobstays. You'll often see chain bobstays where wire would suffice (strength-wise) for just this reason. Anchor rodes, floating debris, docks, dinghies, etc., will all likely be found chafing away at your bobstay at one time or another. For the same reason, i think rod bobstays are a bad idea too; with no resilience, the inevitable impacts are bound to severly stress the metal.