Now even the heaviest packages can withstand rough handling. Our Scotch Heavy Duty Shipping Packaging Tape holds strong on all box types, including 100% recycled boxes. It's even guaranteed to stay sealed. The strong, tough, solvent free hot melt adhesive locks in your heavy duty contents and locks out everything else. You don't need layers of tape to get the job done-just one strip at a time-so you save time. Your heavy packages can bear the weight and stay sealed through it all with Scotch Heavy Duty packaging tape.. 3.1 mil thick. Made locally, with globally sourced materials. Heavy duty seal, even though rough handling. Provides excellent holding power for heavy-duty packaging and shipping. Release coating makes unwind easy resists slivering, splitting and tearing. Clear backing and instant adhesion. Meets U.S. postal regulations for standard packages. Guaranteed to stay sealed (If your box does not stay sealed, 3M will refund the purchase price of this tape, proof of purchase required). Scotch brand's strongest clear-to-the-core packaging tape. You don't need layers of tape to get the job done - just one strip - so you save time. Your heavy packages can bear the weight and stay sealed through it all. Strong, durable solvent-free hot melt adhesive seals and protects. Strong seal on all box types, including hard-to-stick-to 100% recycled boxes