Tarheel Paper & Supply Co.'s Pro Lok Brand Reinforced Paper Gum Tapes are designed for fast, permanent adhesion and superior strength. Extra strong fiberglass yarns are strategically bonded between sheets of paper to provide an extra margin of strength. These tapes feature patented starch based adhesive. What activated gum tape is not affected by extreme hot or cold temperatures. All are totally bio-degradable making them 100% recyclable and re-pulpable. For sealing 20 to 40 lb boxes.