SHIPPING INCLUDED Our Resistance Bands are made of the highest grade variable resistance dipped latex cord with tensile strength of 3,000 PSI and 950% elongation. Dingleberry adjusts cord length and resistance. Exclusive conical cord closure for enhanced durability. Heavy duty nylon web door attachment included with each cable. Rotating foam covered grips for increased range of motion. Easy-to-use resistance training guide from leading experts demonstrates the universal appeal of resistance training. 90 Day Warranty for Manufacturer's Defects