3M(TM) Metalized Film Tape 8437 Silver, 1/2 in x 72 yd 1.0 mil, 72 per case Bulk 3M(TM) Polyester Tape 8437 Silver, 1 mil (0.03 mm) metalized polyester film backing with an acrylic adhesive utilizing an easy release silicone treated paper liner. 3M(TM) Polyester Tape 8437, ideal for applications where reflectivity and low emissivity are desired. Excellent for splice detection and can be used for applications requiring a conductive surface.