1/2" X 18 yds Deadsoft 1-ounce copper foil backing Conductive acrylic adhesive Common uses include grounding and EMI shielding in equipment, components, shielded rooms, and more Copper foil backing is solderable and resists oxidation and discoloration Typical shielding effectiveness is in the range of 60dB to 80dB (30 MHz to 1 GHz) Mfr 054007-27551.