?Upgraded Resistance Bands Set of 5?Our Black Resistance Bands Set Features Higher Thickness and Resistance Strength than Others. Ours-X-Heavy-1.3mm-45lbs~50lbs,Others-X-Heavy-1.1mm-30lbs~40lbs ;Ours-Heavy-1.1mm-35lbs~40lbs,Others-Heavy-0.9mm-20lbs~30lbs ;Ours-Medium-0.9mm-25lbs~30lbs,Others-Medium-0.7mm-15lbs~20lbs ; Ours-Light-0.7mm -15lbs ~20lbs, Others-Light-0.5mm-10lbs~15lbs ; Ours-X-Light-0.5mm-10lbs~12lbs, Others-Light-0.35mm-5lbs~10lbs. Please Message us for Extra E-book of Instruction. ?Eco-friendly Material? Our Black Resistance Band Loops are Made from 100% Natural Latex, which is Safe and Eco-friendly. They are of Strong Resistance and Great Durability. Classic Black Color is always a Nice Choice, and You will Love them at the First Sight. ?Portable Exercise Partner? Our Black Resistance Band Set Comes with a Drawstring Bag. So You can Use it at Home or on the Go. It Provides Great Assistance to Various of Fitness Workout, Such as Yoga, Pilate, Crossfit Stretch Training . You can Apply it to Different Positions to Train the Muscles in Arms, Chest, Belly, Butt, Legs. You can Follow Our instruction E-book to Exercise. Besides, You can also Learn from Many Videos on Internet for Sure. ?Friendly and Versatile Use? Our Black Resistance Bands Fits for Most of Fitness Beginners as Well as Regular Gym Exercisers. Even You can Find it in Athletes? Pocket. Besides, It is Strongly Recommended by Pro Physical Therapist to Help People Recover from Postpartum or Sport Injury, Especially in Rehabbing Muscles, Joints for Mobility and Strength Recovery. What improvements have we made? 1. Resistance: 10-50 lbs instead of 5-40 lbs 2. Thickness: X-Light = 0.5mm, Light = 0.7mm, Medium = 0.9mm, Heavy = 1.1mm, X-Heavy = 1.3mm; others' X-Heavy = 1.1mm 3. Perimeter: 600mm instead of 500mm. 4. Material: made of highest quality 100% genuine eco-friendly latex (not rubber bands which are much cheaper and tend to break easily). They are stronger and able to stretch further. 5. Color: Classic black is preferred by men. And in Fitness Bands The resistance level icon is printed on it for easy identification and carrying. These bands are ideal for -Pilates training -Home Fitness -Injury rehabilitation -body shaping -weight loss -physical therapy What makes our resistance bands special? These bands are rigorously tested to be snap, stretch and sweat resistant. You get 5 resistance bands set and you can combine multiple bands to find your ideal resistance. These bands are so lightweight that they make a great travel fitness kit.