The BLACKROLL GROOVE PRO has a rutted surface that creates a natural vibration. The grooves on the BLACKROLL will slightly vibrate when rolled, which improves blood circulation. It offers a strong massage and helps treat and prevent cellulite. The pro version has the same features as the standard version, but is 50% harder. This version's higher density foam is recommended for professionals. 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 GROOVE PRO is easy-to-clean, water resistant and odorless.