ITEM NAME:30mm x10M Copper Foil Tape EMI Shielding Guitar Slug Snail Barrier #gib Store Home Promotion Hot Item Add to Fav.Usage : Mainly used to eliminate electromagnetic interference EMI, to prevent body harm from electromagnetic wave. Type : Copper Foil Tape. Size: 30mm x 10m. Weight: 106g / 3.7oz. Elongation: 7-7% to 3-4%.