Estone Copper Foil Tape EMI Shielding For Fender Guitar/Slug And Snail Barrier New Copper Foil Tape EMI Shielding For Fender Guitar /Slug And Snail Barrier Material: 99.98% copper with adhesive back (copper color on both sides) EMI shielding for electronic components Shielding for the back of guitar pickguards and cavities Eliminate Electrical noise and humming