Smooth and luxurious, these medium-sized Ben Wa Balls are hand blown from borosilicate glass and designed to increase muscle control for stronger, more frequent orgasms. The jiggling motion of the balls means you also benefit from extra stimulation. With a combined weight of 62g, they are an ideal step-up for beginners who are looking for more advanced toning exercises. Insert them into your vagina after coating the balls in silicone or water-based lube and clench your muscles to hold the balls in place. Not only does this tightening motion increase your strength, it also delivers exciting-yet-discreet stimulation. After a little practice, the balls can be worn for longer for effective toning of your kegel muscles. Why not explore temperature play by warming or cooling the ultra-strong borosilicate glass before insertion for enhanced sensations and pleasure?