Industrial Self-Fusing Black Silicone Rubber Emergency Repair Sealing Tape 50% Wider, 50% Thicker, 50% Longer, 50% More Insulation Than Standard Tape 50% Wider, 50% Thicker, 50% Longer and 50% More Insulation Than Standard Tape A fusion tape that chemically and physically bonds to itself wherever it overlaps 1.5" x 15 ft 0.030" Thick, Insulated 12,000 Volts per Layer It is a silicone based product that is a wonder of modern chemistry Made in USA! UL Listed! Meets Military Spec!