Cable recommendations.

[itu]

...and underplating is usually nickel (Ni). Still in a place like plug and jack the wearing resistance should be substantial. If the base material is hard, it helps the coating a lot (and the other way around). Otherwise coating a piece of cheddar with diamond like carbon (DLC) results like it was coated with carbon like diamond. No support, no hard surface. 

[Norris]

I've had my lead for quite some time now and it's done a lot of gigs... and the jacks are still gold 😁