The no excuse Kegel exercise system that is easy to use and convenient(use them to work, gym or while running your errands). Made from velvety smooth silicone with internal rumbling balls that create a discrete, arousing sensation. AMI 1(weight 47g) is for the beginners or those getting back into an exercise routine. AMI 2 is a double-ball system that is heavier to increase the challenge(weight 78g). AMI 3 is smaller, slightly firmer and heavier(weight 106g) for the more experienced user. Packaged in an attractive gift box. A great value purchase with important health benefits.