Available in a variety of forms, the balls may be solid and singular or the larger versions made of plastic encasing lesser balls are called Duotone balls. They are used by inserting them into the vagina and using the Kegel muscles to hold them in, stimulating movement and/or vibration.
Ben Wa balls should not be confused with anal kegel exercisers and prostate stimulators for men: Ben Wa balls sometimes have a retrieval string or attachment of some sort, but they do not have an adequately flared base for safe anal play.
Ben Wa balls may also be used to simply increase the strength of the pelvic floor muscles, this sexual practice has been used for centuries, and the Kegel exercises are used today. Similar to Kegel exercises, Ben Wa balls and other shaped vaginal weightlifting equipment are recommended by gynecologists and obstetricians to increase vaginal elasticity and bladder control.[