300LBS HEAVY DUTY RESISTANCE BANDS: If you have high requirements for muscle and strength, you will like heavy duty exercise bands, it will help you get more of what you want! The workout bands can be used alone or stacked in any combination to a maximum equivalent of 300 lbs with 6 different resistance levels: 25lbs, 35lbs, 45lbs, 55lbs, 65lbs 75lbs. Whether you are an experienced fitness enthusiast, Professional athlete, or a beginner. they're the perfect workout equipment for men and women SUPERIOR QUALITY EXERCISE BANDS: For maximum longevity and safety during use, the 47" long resistance bands are made of high-grade natural latex with high-density nylon webbing and sturdy heavy metal climbing carabiners that won't break or deform. Each tube fitness band is double-layered and carefully constructed to provide maximum resistance. making it more elastic and durable, safe, and reliable. Which can withstand intense daily exercise sessions and ensure your training goes perfectly.