Nomi Tang has made a serious set of balls. If you are serious about Kegel exercise then you have found the right tools. The two-piece set comes in a gorgeous box lined with silver cloth. I started my physical training with the single ball and made it part of my 20-minute daily routine. The anatomically designed shape helped keep them in place as I would go about my business. The stimulation was exciting as I felt the light vibrations inside of me. After four weeks I switched from the single ball to the double ball. This took a little more thought and reaction to keep in place. It has now been about 10 weeks and not only have I noticed results, so has my partner.