Filament Reinforced Heavy Duty Tape 4.0 Mil 1" x 60 Yards Fiberglass Packing 18 Rolls Glass Reinforced and Pressure Sensitive. Total Thickness: 4 Mil, Clear color & 100 lbs Tensile Strength. Excellent for both industrial and residential purposes. Smooth unwind quality and strongly seals to surfaces. Excellent Adhesion to Corrugated Cartons and Outstanding Holding Power.