Profile: Sigma Extruding Corp. manufactures stretch films. Our product line includes both blown & cast, machine & hand films, and specialty films. Our hand films include classic blown, world wrap, extended core, supreme, ecosupreme and sigma stretched. Our machine films include select cast, magnum cast, summit cast and secure blown. Our specialty films include UV stabilized film, wide web stretch film, bundling film, high performance blown silage film and narrow banding films. Our magnum stretch 300 provides optimum load-retention when pre-stretched from 250 to 300%.