Resistance bands are made of TPE with great elasticity and good durability.They are light weight, portable and space saving exercise equipment.Designed to effectively building muscle strength and tone the body.Strong cushioned foam handles with Zinc alloy clips and D-RingPerfect for Yoga, ABS,workout.Different resistance level from 5kg to 20kg to accommodate for progressive strength training levelsThese tubes have 5 levels of resistance and can be used 1, 2, 3, 4 or all 5 at a time. Reliable Metal ClipsProvide Foolproof Attachment to Handles & Ankle Straps1 & 2: Foam Handles3: Ankle Straps4: Door Anchor5: Ankle StrapsArms & Back TrainingButt Training for GirlsHere are some good examples of the door anchor in action:1. Door Anchor2. Door Anchor3. Door Anchor1. Back Exercise2. Chest Exercise3. Arms Exercise4. Abs Exercise5. Leg Exercise6. Shoulders Exercise