REVO Preservation / Heat Shrink Wrap Tape: 4"x 60yd (Light & Heavy Duty) (CASES)REVO Preservation Heat Shrink Tape (4 INCH x 60 YARDS) (7. 5mil to 9mil) This Shrink Poly Tape was specially formulated to meet the demanding needs of Shrink Wrapping applications. Heat preservation shrink tape, made up of "polyethylene", was made for the shrink wrapping industry, however this amazing product has found itself being used in many other industries as well. Comes in cases of 12 TAPE DOES NOT SHRINK. It is used to tape shrink wrap films