3M(TM) Aluminum Foil Tape 1450 Silver, 6 in x 60 yd 3.1 mil 3M(TM) Aluminum Foil Tape 1450 Silver, 3.1 mil (0.08mm) dead soft aluminum foil backing combined with a transparent rubber pressure sensitive adhesive 3M(TM) Aluminum Foil Tape 1450, dead-soft aluminum foil backing with a rubber adhesive, designed for holding, sealing and protection on more difficult to adhere to surfaces. Foil backing provides an excellent reflective surface for both heat and light.