<https://freedomsafesandarchery.com/shop/archery/nock-sets-and-d-loop-material/gibbs-super-flex-d-loop-material-purple-25-ft/#product>
<http://schema.org/description>
"D-loop material that will not stretch or collapse, burns large ends and has a diameter od 1.8mm.Features:Will not stretch or collapseBurns large ends1.8mm diameter"
<https://freedomsafesandarchery.com/shop/archery/nock-sets-and-d-loop-material/gibbs-super-flex-d-loop-material-purple-25-ft/>