HIGH QUALITY MATERIAL: The resistance bands are made of 100% high-grade natural rubber, which prevents the resistance bands from breaking and provides longer durability. Different colors and 4 pull-up strap levels: 4-piece set of pull-up auxiliary straps corresponding to different colors, yellow (5-10 lbs), red (15-30 lbs), black (30-60 lbs), purple (60-100 lb), 81-inch length, can be used individually or combined with multiple fitness bands for added challenge. Suitable for Multiple Uses Sports & Multi-Function: The resistance bands provide effective training for a variety of calorie burning, muscle building and fat crushing workout programs to tone your arms, shoulders, chest, glutes, legs and more. LIGHTWEIGHT AND PORTABLE: The resistance band set is portable and comes with a waterproof bag for you to carry with you, so you can use this resistance band set to exercise anywhere, whether at home, the gym, or even while traveling Continue your daily exercise. Great gift idea. - For anyone looking to expand their home gym, build a fitness regimen, exercise on the go, or do physical therapy, it can meet your exercise needs whether you're a beginner or not.