Add resistance to standard strength building exercises, like chest presses and squats. Offset body weight for pull-ups and tricep dips. Bands are also a great tool for increasing flexibility and range of motion. Available, and sold separately, in seven resistance levels: extra light, light, medium, heavy, extra heavy, ultra heavy, and super heavy. Each closed loop band is 41 inches long and is made from seamless latex rubber designed to resist breakage. Width and weight of band depends on the resistance. Since 1986, Power Systems' passion for fitness has been fueled by our customers. Power Systems is committed to ensuring people have the tools to lead active lives with professional-grade products, cutting-edge educational materials, and elite customer service. “Power Your Potential” is the philosophy that guides everything Power Systems stands for.