Love Balls or Ben Wa Balls are made of different types of materials — metal, plastic, latex, glass, even jade (of course mercury is no longer legal). It is important to pick balls that do not easily collect bacteria so I suggest metal or glass. Try to find balls that are hollow and weighted with smaller metal balls inside them; these balls move as you move causing your vaginal muscles to tighten due to the sensation. Some women keep their ben wall balls in for a few hours while others the entire day. Beginners should probably start out with small set of balls and graduate up to larger heavier ones. I suggest you use your balls at home before wearing them out in public. You don't want to lose your balls in your pants at the office and put yourself in an uncomfortable situation.