3M 425/SI160 Scotch 425 Aluminum Foil Tape: 1" x 60 yd, Silver Core: 3 inch diameter Backing/carrier: aluminum foil Adhesive: synthetic acrylic Thickness: 4.6 mils (carrier, adhesive) 2.8 mils (carrier) Adhesion: 47 ounces per inch (to stainless steel test panel)