Nashua 557 Premium Grade Flex Duct Tape: 2 in. x 60 yds. (Metallic) Adhesive: rubber Backing/Carrier: polyethylene coated cloth Certifications: UL181B-FX, LEED EA Credit 1 and EQ Credit 4.1 Thickness: 14 mils (total) Adhesion: 45 ounces per inch (to stainless steel)