This kegel ball set is the best invesetment you can do in better sex, better orgasms and a stronger pelvic. Try this over the next month with having the Kegel balls inside for 15 minutes every day. This will make your pelvic work and get stronger. There are 3 different level of balls and the most heavy one is the most difficult. Try to work your way up and feel the difference next time are with your partner.