Constructed of heavy duty 4 mil black carbon impregnated Low Density Polyethylene (LDPE) film to create an extra strong static barrier. Meets specifications of MIL-P-82646, Rev. A. Protects against electrostatic charge, chemicals, abrasion and humidity if heat-sealed. Neatly wound on a 3″ core with 1″ diameter core plug. Manufactured to exact specification to ensure even wall thickness. Can be heat sealed, tied, stapled or taped shut. tapled or taped shut. Sizes 4″ and above are Made in the USA. See our Tubing Dispensers for making your own custom-sized bags and Ties & Tapes for bag closure ideas.