Hi,
Actual parachute cord is constructed of nylon. It has a stranded core and a woven mantle, just like climbing rope, this makes it very stretchy. The design with a highly stretchy cover requires nylon. Dacron does not stretch much at all, so if you want stretch use chute cord, it is also more available and much cheaper. I use 1200lb test halibut line, which does not stretch much at all and encase it in plastic tube. The rest of the construction process is the same as SaSpearo's except that I seal the ends with hot glue.
I hope that this helps. Chute cord is available is most outdoor stores, cheap.
Best wishes,
Doug
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