Mil Spec 43668/55301 and 17337 Black Nylon Webbing, manufactured in the by Narricot Industries.
Sold in 5 Yard Segments. So if you order (1) you get 5 continuous yards. If you order multiply of the same size, it will come in one continuous piece up to 50 yards. Sometimes there are splits in the rolls so if you're ordering more then 5 yards there's the potential for a split somewhere in the yardage.