>>1000sqft Rolls (4ft x 250ft) >>>4 mil Perforated.>>> For residential retrofit, particularly in the attic laying over existing insulation, and some OEM applications. Available in 500 and 1,000 sq. ft. rolls or custom lengths.>>> Only available in perforated 4' widths.>>> Super R Diamond® brand radiant barrier was the first product developed by Innovative Insulation. Super R Diamond® is two-sided reflective aluminized polyester film with reinforced scrim inside, designed to reflect radiant heat no matter what the season. Choose Super R Diamond® to retrofit an existing structure. It can be stapled to the underside of the roof rafters in an attic.