Thera-Band latex exercise bands are available in 8 different color coded levels of resistance. If you would prefer latex free, Thera-Band also offers 5 color coded levels of resistance that do not contain latex. The Thera-Band Resistance bands are used to strengthen and stretch muscles. Thera-Bands assert positive and negative force on muscles which in turn strengthens the muscle group that is being worked. Great for individuals who workout at home, athletes, dancers and gymnasts.