Resistance Bands Have 3 Different Levels of Resistance - Light， Medium， Heavy ， Great for Arms & Legs and Upper & Lower Body Exercisesmaterial: Quality Latex ， circumference: 19.6 inches ( 50 cm) width: 1.96 inches (5cm) . very light and small easy to take.Suitable for Flexibility， Crossfit， Pilates， Dance， Ballet and Yoga Flexibility Workouts.These resistance bands is very durable and fit for everyday use.Any problem please contact us，we will do the bestDescription: material: Quality Latex . very light and small easy to take. circumference: approx. 19.6 inches (50 cm) width: approx. 1.96 inches (5cm) light(red): Thickness: approx. 0.45 mm medium(blue): Thickness: approx. 0.6 mm green(Heavy): Thickness: approx. 0.9 mm Feature : Perfect for Physical Therapy and Rehab Strengthening of Glutes， Legs， Hips and Knees Easy to Use Great for Travel Suitable for Flexibility， Crossfit， Pilates， Dance， Ballet and Yoga Flexibility Workouts. If you do not know how to use， you can check our pictures clearly.thanks. About shipping，we will ship the items out within 2 days by USPS，as it's from china，it normally takes 15-25 days，we will offer tracking number as soon as we send out the items.please feel free to contact us if you have any problem.we will do our best.