TheraBand Resistance Bands, 50 Yard Roll Professional Latex Elastic Band For Upper & Lower Body & Core Exercise, Physical Therapy, Pilates, At-Home Workout, & Rehab, Green, Heavy, Intermediate Level 1 A superior band product for resistance training and rehabilitation. Improves strength, range of motion and flexibility in a simple to use. Color-coded Progressive Resistance system allows users to recognize improvement as it happens. Highest quality natural rubber latex resistance bands are recognized as the original system of progressive resistance for over 40 years Provides both positive and negative force on muscles and joints. Stretches tones and conditions all major muscle groups. Portable product that works in the clinic, the gym, at home or on the road. As you grow stronger you can move up to the next color. Heavy Green Bands are the fourth of eight levels of resistance and great for rehabilitation and light to moderate resistance exercise, they offer 4.6 lbs. resistance and 25% increase from preceding color at 100% elongation, and 6.7 lbs. at 200%, roll measures 50 yards long x 5" wide