TheraBand Professional 50 Yard RollTheraBand latex exercise bands are available in 8 color coded levels of resistance. Proper use of the Thera Band Professional 50 Yard Roll for resistance exercise provides both positive and negative force on the muscles, improving strength, range of motion and cooperation of muscle groups. Color coded progressive resistance gives at a glance documentation of progress from one level to the next. Thera Band Professional Resistance Bands help users