Nen Wa Balls Magnetic Hematite Graphite 2 perfectly weighted magnetic hematite balls. Ultimate arousal. Pleasure anytime, anyplace. Waterproof non-vibrating Ben Wa style balls. Body safe. Phthalate free, non-toxic materials: Iron Sesquioxide. Diameter 1.18 inches. Approximate weight: .13 lb each. Nen Wa Balls from Nasstoys of New York.