Our Resistance bands are made of natural latex material, which is strong wear resistance and can withstand extreme tensile force. You can train without any worries of tear or wear. Our resistance bands work for anyone who needs to stretch out those sore achy muscles after a workout and stiff ones before the workout. You can use them to stretch out before deadlifts and squats. Resistance bands can be used for multiple exercises, such as strength training, assisted pull-ups, basketball tension training, warm-ups, etc. You may add to your home gym. It will help assist in YOU pull-ups at home or use them for pull-up and dip assist, stretching, and even adding some resistance to squats. Pull-up assist bands come in 4 resistance levels, and each color is different resistance and width for different purposes. Red Band (15 - 35 lbs); Black Band (25 - 65 lbs); Purple Band (35 - 85 lbs)； Green (50-125lbs).