S&M Steele balls is made of 100% stainless steel. The ball weighs 37 gram each with a diameter of 2cm. The steel ball is perfect for vaginal stimulation and exercise use. This kegel ball is designed specially for daily use. This sex toy keeps you stimulated while having it inserted into your vagina when moving around. With regular use, you will enjoy an improved muscle control, stronger and more frequent orgasms during sexual intercourse. The steel balls are weighted so that you have to consciously contract your muscles to keep them in. It is helpful with strengthening vaginal muscles for better sex, strengthening your bladder control, using it during sexual intercourse for extra thrill and use it while moving around for an extra stimulation. These steel balls are nickel free and comes with a soft storage bag.