Jade eggs are designed for women who want an alternative to a ben wa ball for kegel exercise and to improve vaginal strength and lubrication.
A Chinese doctor and I designed these to be the best size for women. He says that using the eggs is "vaginal kung fu" because it strengthens and tones and gives that part of the body more power and feeling of well being. Doing kegal exercises is easier when you have an object for feedback about what you're doing. Most people who do kegals aren't doing them with enough effort, and these can help. And jade is related to the body qi, energy. Jade energy is healing to the body, and jade qi and body qi work together. That's one of the reasons Chinese people love jade. It's natural stone, smooth, and is compatible with the body.
In additional to kegel exercise, using jade eggs helps increase vaginal lubrication and moisture for every day comfort as well as for sexual intercourse.