A superior band product for resistance training and rehabilitation, provides both positive and negative force on muscles and joints, stretches tones and conditions all major muscle groupsnSimple u0026amp; easy to use product for upper u0026amp; lower body exercises that can be performed anywhere, is ideal for conditioning u0026amp; rehabbing musclesnColor-coded Progressive Resistance system allows users to recognize improvement as it happens, as you grow stronger you can move up to the next colornHighest quality natural rubber latex resistance bands are recognized as the original system of progressive resistance for over 40 yearsnEach band measures 5 Foot long by 4 Inch wide and comes in two color-coded resistance levels: Blue-5.8 - 8.5lbs.; Black-7.3-10.2lbs.n