Americover 20 ft. x 100 ft. 6-mil String Reinforced Polyethylene Construction Film Layers of low-density polyethylene (LDPE) and one layer of polyester string reinforcement scrim Scrim Reinforcement greatly enhances tear resistance and increases service life Used for crawlspaces, temporary walls and barriers, etc. 6 mil thickness 20 ft. x 100 ft. roll