Exclusively Nasstoys! Wisper Collection Nen Wa Balls Purple. Ben Wa style balls feature a polished finish. Sturdy retrieval cord. Waterproof, non-vibrating sex toy. Nen Wa Balls are made using phthalate free, non-toxic materials ABS plastic. Each ball measures 1.25 inches in diameter. These balls do not move by battery power but rather by kinetic energy. Can be used in conjunction with Kegel exercises. Always clean before and after use. Wisper Collection Nen Wa Balls Purple from Nasstoys of New York.