The finish – velvet touch – is soft and safe. The usage of Geisha Balls2 is simple and clear. There are four balls in the packaging, every ball having different weight – we include one of the lightest and one of the heaviest balls on the market. The idea of training is to start with the lightest balls and then gradually increase the weight as you do during a workout. Geisha Balls2 allow you to have five stages of training – from 50g / 1.8oz to 100g / 3.5oz. After this, experienced users can train using the individual balls without the strap. As your training progresses, you use a heavier ball from the Geisha Balls2 set. Geisha Balls2 are body-safe and anatomically shaped. They are made of ABS plastic with a strap made from 100% soft medical silicone. The Geisha Balls2 are covered by a one year warranty. Please contact the manufacturer for details.