Thera-Band Band Loops for the first time provide continuous loop elastic bands in the same colors and resistances as authentic Thera-Band System of Progressive Resistance. They feature 4 resistance levels, including Yellow, Red, Green, and Blue supplied in 3 lay flat lengths of 20cm, 30cm and 45cm. The 7.6cm wide loops can be used for a variety of applications, particularly lower body exercises to increase strength and balance.