8.0 mil (0.203mm)Polyethylene-coated cloth duct tape, natural ruber adhesive. General purpose for bundling, seaming, vinyl repair and patching. Conforms well to irregular surfaces. Will not twist or curl during application. Tensile strength : 20 lib/in. Adhesion to steel: 35 oz/in. 3" neutral core/carton. COLOR: Sylver (gray).

Mill:

• A "mil" is a unit of thickness equal to one thousandth of an inch. 
• To convert mil to inches take mil & divide by 1000. 
• Thus, a 2 mil bag would be .002 inches thick.
• Example: Ex: 2 mil/1000 =.002 inches