Kegel Balls, also known as Ben Wa Balls, are insertable weights that go inside your vagina. Ami balls retrain your pelvic floor muscles and stir up a wild sensation inside your vagina as you exercise. Ami Kegel set comes in three weights - Ami 1 is a soft weight single ball. If you are new to Kegel exercises, start here. Ami 2 is a soft, medium-sized, double ball that is slightly heavier. Ami 3 is a small, hard and heavy double ball for experienced users. Ami is discrete, it is like walking around with a naughty little secret inside you.