Flexible, waterproof, split-, burst- and stretch-resistant polypropylene film backing provides peace of mind. Superior-gripping hot melt adhesive ensures a strong bond. Tape is UPS and Parcel Post Approved for cartons up to 50 lbs. Tape Type: Packaging; Adhesive Material: Corru-Grip Synthetic Resin; Width: 2"; Thickness: 3 mil.