What is the Roller Ball? Featuring a unique design the roller ball provides an effective massaging technique that helps to ease stress & tension by spreading pressure, which will leave you feeling relaxed. The roller ball is durable & easy to use & can also be used wet or dry. When can I use the Roller Ball? The roller ball can be used anytime at home to help relieve stress & tension & is also suitable for professional use too. How does the Roller Ball work? The durable roller ball works by providing a very effective massaging technique & has an omni-directional ball that spreads pressure, which helps to relieve stress & tension to leave you feeling relaxed. The roller ball is easy & comfortable to use & helps to reduce stress on your fingers, hands & elbows. The roller ball can be used hot or cold as well as dry or with a range of massage oils. The ball is 9cm long & has a diameter of 6.5 inches.