These stones are the original ones in ECO2-shower showers. This pack allows you to complete or change the natural tourmaline, germanium and clay stones present in its handle when they are worn out. These stones are used to purify water by neutralizing lime, chlorine and impurities. No more dry and irritated skin, on the contrary the skin will be hydrated and softer with a regulated pH. Ditto for your hair, which will be more supple and silky. Here are the details of the benefits of each stone: Tourmaline: It reduces skin problems and improves blood circulation. Clay: It helps get rid of toxins, calms irritations, and promotes healing.