The BLACKROLL FLOW has a revolutionary surface design that offers two different types of massages. One side offers a soft roll out of the fascia, while the other side is harder and provides an active stimulation. The BLACKROLL FLOW is notably softer than the BLACKROLL GROOVE STANDARD and vibrates without a trace of 'jumpiness'. This roller is environmentally friendly as it is made using an energy-saving production process and it is free of propellants and chemicals. The German-made BLACKROLL FLOW is easy-to-clean, water resistant and odorless.