Heavy-Duty Fiberglass Reinforced Kraft Gummed Carton Sealing Tape can have water-activated adhesive bonds immediately. Reinforced tape features embedded tri-directional fiberglass to prevent tearing. Choose economy for cartons under 20 lbs, light-duty for up to 30-lb. cartons, medium-duty for up to 40-lb. cartons, and heavy-duty for up to 60-lb. cartons. Use economical, non-reinforced gummed tape to seal mailers. Call for details about custom colors, sizes, and printed messages. Dispensers are also available.