The nylon webbing type 13 Class 1a is manufactured in accordance with Mil-W-4088K specifications. The webbing is made from yarn-dyed threads in a plain weave. Plain weave is the simplest and most durable weave due to its high thread density. A black thread is woven into the outer edges of the webbing to indicate the tensile strength. According to the manufacturer, the webbing has a width of 44.1 mm, a material thickness of 2.6 mm, and a tensile strength of 7000 lbs.
Source:
Mil-W-4088
Mil-W-4088K is a military spec for nylon webbing and Berry Amendment compliant with all appropriate testing and paperwork.
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