Comes in 5 different resistance strength levels: X-Light, Light, Medium, Heavy and X-Heavy. They're suitable for beginner or a seasoned workout sports man. These resistance bands are often used for sports and fitness, experienced athlete or just beginners for fitness training. Made from 100% natural latex which is extremely durable. The bands will maintain their resistance for a long time and does not absorb sweat. This stretch bands is flexible and easy to carry cause there has a portable bag that you can target the muscles where you want to work on and train everywhere at any time.