Zing-it is an arborist Dyneema throw line twine. It is available in 1.5 and 2.2mm diameters. It appears to be comparable to Z-Line slick. While Samson says that Zing-it is not spliceable, it is a hollow braid cord and can be spliced. I have made tieout cords from Zing-it and even whoopie slings. They work, but aren't significantly better than nylon cord. For a ridgeline or a throw line, Zing-it is fine, but it's overkill for most other uses. If you use it as a throw line and it snags, you won't be able to pull it in two to retrieve your bag.