Strengthening of the kegel muscles provides a wide variety of benefits to the female body, including minimizing menstrual cramps, helping with incontinence, creating stronger climaxes, and allowing a tighter vaginal grip during intercourse. Dr. Fulbrights Kegel Exercise Kit is a doctor approved method of building up your PC muscles. Made of premium, medical-grade silicone, these kegel balls have sensual grooves that add additional sensations to the vaginal walls. Weighted interior balls give your body a challenge as your pelvic floor muscles flex to maintain their grip. Not compatible with silicone lubricants. Clean with mild soap and warm water after use. Instructions included. Measurements: Single is 5.5 inches in total length, 1.25 inches in diameter. Double is 7.5 inches in total length, 1.25 inches in diameter. Material: Silicone, ABS plastic. Color: Pink. Note: Set includes 1-single, 1-double, and instructions for use.