[Sustainable and durable 100% cork massage ball set] Made from sustainable cork, the TRNR cork ball set is convenient for on-the-go self-myofascial release and is seamlessly designed to suit your body's needs. Whether you're targeting stiff areas like the jaw or hands with a small massage ball, or relieving tension in large muscle groups with a medium-sized ball, this set allows for a customized self-care massage experience wherever you are. Cork is not only a functional benefit, but also a recycled resource that incorporates both environmental awareness and personal health. Lightweight and durable, it naturally resists microbes and germs and promotes hygiene effortlessly.