Aetna? Etna? coil type guide

[pullrachet]

Question: Are these spring stainless or softer welding rod material? Not referring to any specific model, just the coil type in general. Were these considered good back in the day or just another?

[philaroman]

those were great by yesteryear standards,
but half a century of progress has benefits
if you pay $$$+, you can get same style in titanium:
https://reelseats.com/collections/recoil