The She-Ology Interchangeable Weighted Kegel Set is ergonomically designed to tighten and tone pelvic muscles. Created to give you a fully customizable workout regimen, the set of 6 variable weighted kegel balls can be mixed and matches with the single or double ball holder to give your muscles exactly what they need. From smallest to largest, the weight set include 20 g, 25 g, 30 g, 35 g, 40 g, and 45 gThe premium silicone weights assist to train and tone kegel muscles, increasing sexual satisfaction, sensual stimulation, and pelvic floor strength with every use. The graduated set has been created to tone and tighten kegel muscles over time. The hypoallergenic premium silicone set is body safe, unscented and phthalate free to keep you most sensitive spots, happy and healthy.