Master Series Jaded Glass Ben Wa Balls. These artfully designed glass ben wa balls are meant to be admired and desired. Ideal for Kegel exercises, for tightening the vaginal muscles, and heightening sexual play. These darkly sexy glass spheres are smooth, sleek, and easily maintained. Made of hand crafted borosilicate glass, so they are temperature resistant and easily sterilized. Add a little spice with some thrilling temperature play. These jade tinted glass balls can be served warm or cold. Measurements 1.2 inches in diameter. Material Glass. Color deep transparent green.