QUALITY MATERIAL: The exercise resistance ropes are made from 100% free of Latex,highest quality rubber and TPR Foam for maximum strength and resistance. TRAIN WITH COMFORT: They have D-handles, pre-attached, for continued comfort during repetitive movements. Comfortable and slip-free grip. RESISTANCE: 30 to 40 LBS. Resistance tubes are specifically designed to challenge your core muscles. Adaptable for Multiple Fitness Levels, whether youre a beginner or an expert, resistance bands are for you. PERFECT FOR BUILDING MUSCLE: They are perfect for Muscle Building, Fat Burning, Weight Loss, Cross Fitness Training, Pilates, Yoga and Improving Fitness Levels RESISTANCE: 30 to 40 LBS. They are lightweight, easy to carry and great for home, gym and travel.