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If you get a hollow, tubular cord, like parachute cord, or 550 cord, the core can be pulled out.then some other material can be pulled through the middle. This isn't hard if you just need to replace the core for 6 inches or somethin, but if you need 100 feet, it can be a bear!
frequently materials are either : Expensive, or Disposable.sounds obvious, but in this context, being that resilient/durable etc, might mean an expensive piece o string.
Look at both Spectra and Dyneema cordage. These are proprietary fabrics similar in strength to Kevlar, but cheaper and with different (lesser) resistance to heat. They definitely come in <5mm diameters.This stuff is common in climbing and other outdoor gear. Other than online, you might find it in an climbing or outdoor outfitter shop...
You probably won't find your ideal materiel. All things break down over time. Some materials will be better than others but once they (as you put it) "break in" they lose that ability. All strings will stretch. Now you can get pre-stretched materials but then they lose a good bit of their elasticity (aka sponginess). What you'll have to do is research various materials and how they are woven together to get the characteristics you want. But over time they will wear out and will need to be replaced. Nothing last forever.
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