The 9-piece Resistance Tube Set is suitable for any fitness level, with the ability to perform a variety of exercises. The different resistance levels include Light, Medium and Heavy resistances of up to 20kg to help you build muscle, burn fat, and improve flexibility. The multi-clip system allows you to adjust the intensity of your workouts to suit your personal goals. The bands can be used alone or stacked in any combination. A durable door anchor is included in the packaging, which will hold up the exercise bands during your workout. The resistance bands provide consistent resistance for every movement and give you enough flexibility to do hundreds of different exercises from beginner to advanced level in the comfort of your home.