The Wellness Kegel Training Kit delivers a fully customized strengthening routine. This complete set includes six balls, progressively weighted in pairs from 0.6 ounces to 1.8 ounces. The satin smooth silicone balls can be used alone or in pairs, for a total of nine possible weight combinations. Wellness Kegel Balls help strengthen your pelvic floor for better control and more intense pleasure. Make them part of a regular kegel exercise routine, or wear them to heighten arousal during foreplay. All Wellness Kegel Balls are made of platinum cured silicone that's body safe. Clean your toy after use with lukewarm water and a toycleaner.