The 1194 from 3M is an adhesive tape with copper foil backing. This tape is an unplated copper with nonconductive adhesive and commonly used for grounding, EMI shielding and electrical bonding.
Deadsoft 1oz copper foil backing
Non-conductive acrylic adhesive
Supplied on a removable liner for easy handling and die-cutting
Copper foil backing is solderable and resists oxidation and discolouration
Shielding effectiveness is in range of 60dB to 80dB