Ben Wa Balls On A String Silver. Nylon string, weighted ben-wa balls with subtle textured bumps. Easy climax. A woman inserts the balls and will become aroused as they move while she moves or walks around. Also builds muscle strength. The balls are weighted so that you have to contract your muscles to hold them in. This is not only helpful with strengthening vaginal muscles but also helps strengthen bladder control. Now with subtle nubs for added stimulation and a retrieval cord for safety. Kegel exercise, Ben Wa, orgasm balls, non-vibrating sex toys. Always clean before and after use. Ben Wa Balls On A String is a registered trademark for Nasstoys of New York.