super33Scotch® Super 33+™ Professional Grade Vinyl Electrical Tape is a black, 7 mil (0.18 mm) tape, on a 1 in (25.4 mm) core, combines the flexibility of a PVC backing with excellent electrical insulating properties to provide primary3M Scotch Super 33+ Electrical Tape - 1 in x 36 yd (108 ft), Premium Grade All-Weather Vinyl, Resistant to Abrasion, Moisture, Corrosion, Alkalies - 1 Long Roll, Black . Visit the 3M Store.