Premium Quality and Durable - Our resistance exercise bands are made of natural friendly elastic latex which are gentle to skin (Without any man-made materials such as TPE which are less durable and much cheaper). The resistance loop bands set are stronger, stretch further and durable. This workout bands resistance for a variety of legs, arms, buttocks, shoulders, ankles, glutes are great for Kids, Men and Women of all ages.★★★ These loop exercise bands are more perfect for the beginners Versatile with any Workout - This fitness set include five exercise resistance bands with different thickness for Basic set (Yellow: 0.4mm, Red: 0.5mm, Green: 0.7mm, Blue: 0.9mm, Black: 1.1mm) and Pro set (Green: 0.4mm, Blue: 0.6mm, Purple: 0.8mm, Pink: 1.0mm, Black: 1.2mm). Each loop band is 11.8 inches long by 2 inches wide. Our circular bands are great for every popular workout program including Yoga, Pilates, Physical Therapy, muscle training, injury rehabilitation & body Shaping 2 Options - Basic for regular workout with max strengths 10 15 20 30 40 lbs and Advanced for upgrade training with max strengths 20 30 40 45 60 lbs. The X-Light, Light, Medium, Heavy and X-Heavy tension levels make the loop bands more convenient for choice. The extra light & light straps are suitable for beginners and ones suffering from leg, knee, back injuries and help in recovery. The medium, heavy and extra heavy bands are for advanced muscle training