Premium All Weather 8 mil Black Electrical Tape 1.5 in x 66 ft 64 Roll Case (THIS ITEM IS NON-RETURNABLE)Flame Retardant & Cold Resistant 8 mil (0.20mm) Black PVC premium grade electrical insulation tape with a rubber based adhesive. Dielectric Breakdown: 6KV. These special widths are slit to order, and are bulk packed, separated by silicone sheets. 1 1/2" (38.1mm) UL/CSA listed core.