Ergonomically designed to tighten and tone pelvic muscles 6 interchangeable weights for a fully customizable workout regimen Single and double Kegel ball holder with easy retrieval cords Hygienically superior, body safe Silicone Kegel exercise guide from Dr. Sherry included Dimensions: Variable Weight Kegel Balls: 20, 25, 30, 35, 40, 45 g Overall (Single Ball Holder): 4 in. Overall (Double Ball Holder): 6 in. Each Ball: 1.25 x 1 in. Package: 5.5 x 9.5 x 2.5 in.