Check the listing for details. 3M DS-7 EMI electromagnetic shielding braided copper sleeve 7mm x 100m spool. Condition: New. Listed at 449.95 USD. For sale is a brand new, unopened box of 3M™ brand DS-7 electromagnetic shielding braided copper sleeve 7mm x 100 meter spool Product Description:3M™ Electromagnetic DS shielding sleeve consists of a braided sleeve with glass fibers over wound with tin-plated copper foil.Superior shielding effectivenessExcellent strain reliefSuperior flexibilityExcellent heat stabilitySolderableResists oxidation and discolorationUL recognized flame retardancy per ULVW-1 (UL FR-1), Product category UZIQ2, File E120470 Applications:3M Electromagnetic Shielding Sleeves DS & FS Series have superior flexibility and EMI shielding effectiveness. They are used to shield cables in automated equipment, metrology, and harnesses from main board to display components. Shielding Effectiveness:Shielding effectiveness depends on conductivity, permeability, thickness of metallization, degree of contact, smoothness of application surface, strength and frequency of EMI signal, etc. However, using standard tests and fixtures, it is possible to determine a value for the attenuation.