These can give anyone a doorway to the ancient secrets of pleasure. Venus Benwa Balls are ideally designed to keep your playthings internal muscles tight and strong and over time, more sensitive. Benwa balls not only tone and tighten the vaginal muscles, but can stimulate during use, creating a session like no other. Watch your subject as they feel the gentle motions inside, the effort as they tighten to keep them in. The simple, elegant design has been in use for centuries.