This tape came from a top US Aerospace surplus department and was used for Electrical connections on Aircraft... It is flame retardant fiberglass (if you light it it goes out almost immediately)... This is New Old Stock (manufactured in 1998) but still seems to do exactly what is was intended for with no issues... The roll is 3/4" x 36 yards... Quite hard to find and I only have a couple of rolls!...   It will be shipped out fast with USPS!