The SMARTBALL UNO vaginal balls provide an easy way to strengthen the pelvic muscles. The internal weight moves with every step, gently stimulating the muscles. Weighing only 1.4 oz, it is an ideal pelvic floor trainer for beginners. Its ergonomic shape and sleek edge make insertion easy. Every movement is pleasurable, whether walking or during your daily routine. It is waterproof (IPX7) and made from body-safe silicone.