LELO's Luna Beads Noir balls are currently the world's bestselling ben wa balls, or kegel balls. These can be worn during intercourse, as the inner balls will respond to movements with subtle vibrations. More than just building sensations during sex, they also promise an array of health benefits and the potential to have more powerful, consistent orgasms in the future - even if you simply wear them around the house. These waterproof beads are the perfect fit for everyone, and can be worn one or two at a time with the inclusion of a soft silicone harness that allows you to choose your own unique pleasure. The Luna Beads measure 3" x 1.2" x 1.1" in diameter with an insertable length of 3".