Product description 12 x 2 resistance loop bands are made of 100% natural latex free of non-natural thermoplastic elastomer (tpe) and no rubber smell. Exercise workout bands have 5 levels, all of which can be mixed and matched to reach your & fitness & goals, resistance levels are printed on the front of each. This heavy duty resistance band can be integrated with any workout programs, such as: yoga, pilates, squat, stretching exercises, cross fit, weight lifting and more. You can take these portable and lightweight resistance bands with you easily, you can do workout anywhere, your home, office or your trip, like a portable gym. Our stretch bands can be used for physical therapy, recovery, rehabilitation, body curve, fat burning and weight loss. & size: black: 500 * 50 * 1.15mm green: 500 * 50 * 0.95mm blue: 500 * 50 * 0.75mm yellow: 500 * 50 * 0.35mm red: 500 * 50 * 0.55mm & package & list: 1* five exercise bands or three exercise bands 1* convenient carry bag.