The Pure2Improve Resistant bands are constructed from high quality, durable latex and 100 percent high-quality natural rubber. This means that the elasticity of the bands will remain for many years of use. The Bands are small and portable, as resistance bands can be used anywhere from your home to the gym or even the office! This is why we have provided them in a packed bag, to make storage and transporting them super easy! Set provides individuals with many benefits such as how they are an effective and versatile training tool, which has cardiovascular benefits, they can prevent injury by forcing entire groups of muscles to work and stabilizing muscles, increase strength and stability in the upper and lower body, along with being able to be used on all areas of the body, including shoulders, arms, hips and legs.