SurpriseME mini loop bands are designed to be the perfect portable workout accessory you can use for a wide variety of exercises anywhere you go. Each band is 12 inches long and 2 inches wide, making it appropriate for the widest possible range of exercises. It is made of pure Latex Rubber to provide natural elasticity. Resistance level as mentioned below; Green Extra Light 5 LBS Blue Light 10 LBS Yellow Medium 15 LBS Red Heavy 20 LBS Black Extra Heavy 30 LBS