|Use this box sealing tape if you want a reliable, strong and durable tape. The 100% polypropylene film is flexible, waterproof, split-, burst- and stretch-resistant--meaning you can use it in a variety of environments. The extra holding power is designed for use on cartons up to 50 lbs. Plus, with a tensile (bursting) strength of 35 lbs., there's plenty of reason to have faith in this clear tape. Utilizes a hot melt adhesive for a superior grip. Meets US postal regulations.