Nashua 330X/SI250 330X Extreme Weather Foil Tape, 3.5 mil Thick, 50 yd. Length x 2" Width, Silver Core: 3 inch diameter Backing/carrier: aluminum foil Adhesive: acrylic Release liner: paper Certifications: UL723 listed, meets FAR 25.853(a), LEED - EQ Credit 4.1