Polyken 231 Military Grade Duct Tape, 50 lbs/in Tensile Strength, 60 yards Length x 2" Width, Olive Drab Core: 3&quot; diameter Backing/Carrier: polyethylene (PE) coated cloth Adhesive: natural rubber Certifications: ASTM D -5486 Type IV Class 1 (supercedes PPP-T-60D & E Type IV, Class 1); DPM 871-3 Thickness: 12 mils (carrier, adhesive)