100% polypropylene film with hot-melt adhesive. Flexible, waterproof, slit-, burst- and stretch-resistant. UPS and Parcel Post Approved.Good holding power, economical. For sealing cartons up to 25-lbs. 1.85-mils thick, 28-lb. tensile (bursting) strength. All rolls are 2-in. wide (48mm), with a 3-in. core. 6 rolls per pack. Clear 55-yds. (50m)