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. Meets US Postal Regulations for standard packages. Smaller Size on Refillable Dispenser. Grade: Heavy-Duty; Core Size: 1.5"; Dispenser Included: Yes; Adhesive Material: Hot Melt Synthetic Rubber. Features Guaranteed to stay sealed. Provides excellent holding power for heavy-duty packaging and shipping. Strong seal on all box types, including hard-to-stick-to 100% recycled boxes. Strong, durable solvent-free hot melt adhesive seals and protects. Seals seams with one strip so boxes stay closed. Meets U.S. Postal regulations for standard packages.