High end exercise bands. BBB Sports Heavy Duty Resistance Loop Exercise Bands are 12″ by 2″ heavy duty resistance loop bands made of 100% natural rubber and come in 5 varying resistance levels. Green (X-Light) 5 lbs (thickness is 0.35 mm). Blue (Light) 10 lbs (thickness is 0.50 mm). Yellow (Medium) 20 lbs (thickness is 0.70 mm). Red (Heavy) 30 lbs (thickness is 0.90 mm). Black (X-Heavy) 40 lbs (thickness is 1.1 mm). You can also combine multiple bands to find your ideal weight. This makes them perfect whether you are just starting to workout or a seasoned workout warrior. Great with any workout. This resistance band set can be integrated seamlessly with every popular workout program including Yoga, Pilates, and more. Or use them for general exercise, stretching, strength training, power weight programs. Multiple uses. It is ideally used to baseball, basketball, boxing cycling, fitness, football, gymnastics, mixed martial arts, running, soccer, softball, tennis, track & field and volleyball. These resistance bands are often used for sports and fitness, physical therapists love these physical therapy bands to help them rehabilitate their patients. BBB Sports Heavy Duty Resistance Loop stretch bands work for people suffering from leg, knee and back injuries. Superior quality. BBB Sports exercise resistance bands are easy on skin. We stand by the quality of BBB Sports Heavy Duty Resistance Loop Exercise Bands. We know you will love them!