An ancient technique, ben-wa balls are also sometimes called geisha balls and are used for vaginal stimulation and toning.
This set consists of two marble-sized balls that are to be inserted vaginally and manipulated with the internal muscles. This can produce pleasureable sensations from the balls' movement against each other, and will give your internal muscles a good workout from the effort of holding them inside.
By exercising the pubic floor muscles, ben-wa balls help strengthen the vagina for more intense orgasms. These toys are made of ABS plastic coating on a weighted metal core, and weigh approximately one ounce each.