1.LASTING DURABILITY - Our 41' latex fitness bands are crafted with quality and comfort in mind. Made from natural rubber latex that is 99.998% of soluble proteins, these can stretch up to 2.5 times their original length. Their heavy-duty, wear-resistant design ensures longevity and durability. 2.ULTRA VERSATILITY - Closed-loop bands are perfect for assisted pull-ups, powerlifting, physical therapy, Pilates, calisthenics, targeted stretching, toning exercises, and full-body workouts. You can perform over 200 exercises with these resistance bands. 3.STRENGTH LEVEL SPECIFICATIONS - These Combo Pack - #1 Orange, #2 Red, #3 Black, #4 Purple, #5 Green, and #6 Blue comes with different resistance levels. Light Band (5 - 15 lbs), Medium Band (20 - 35 lbs), Heavy Band, (30 - 50 lbs), Robust Band (40 - 80 lbs), Power Band (50 - 120 lbs), Strong Band (60 - 150 lbs). Perfect for anyone from beginners to advanced users, these bands will help you enhance your fitness training.