The Duo Spheres are metal love balls that can be used both vaginally and anally. There is a pull ring at the end, which makes it easy to remove the balls after use. The balls are also easy to insert thanks to the smooth material. They not only provide a pleasant stimulation, but also train your pelvic floor muscles when you use them vaginally. The balls can be cleaned with water and toy cleaner for a hygienic use.