• The small sustainable helper made of black forest wood for the selective and isolated treatment of fabric structures • Ideal for selective treatment of the back extensor & soles as well as for the targeted rolling out of the calf and forearm muscles • A pleasant and warm feeling on the skin thanks to the natural product wood • 100% natural & completely biodegradable • Handmade in Germany from FSC-certified wood • 10-year warranty The double ball is the ideal companion when it comes to selective treatment of chronic tension or the relaxation of “firm” connective tissue structures. The little helper is particularly suitable for muscular tension in the thoracic and lumbar spine as well as for the entire back. The innovative notch saves the spine and thus allows optimal pressure distribution.