My Favourite Duo Balls are a classic sex toy, updated with modern materials and design. The balls are solid so that they create resistance and give you an incredibly stimulating internal vaginal massage. The cord and retrieval loop are made from soft medical grade silicone, so you hardly feel them. Wear these little ben wa balls during foreplay, or use them as part of your masturbation technique. Another quality product from Taboom, established European sex toy manufacturer.