Ben Wa Balls Ancient Chinese legend has it that women first inserted these pleasure orbs into their vaginas and spent hours rocking gently back and forth. They would eventually experience a subtly cascading orgasm of epic heights. Today, this same pleasure can be achieved using these beautiful Ben Wa Balls. When a woman inserts the balls and will become aroused as they move while she moves or walks around. Also builds muscle strength. The balls are weighted so that you have to contract your muscles to hold them in. This is not only helpful with strengthening vaginal muscles but also helps strengthen bladder control. Ben Wa Balls are made using phthalate free, non-toxic materials metal, plastic carrying presentation case. Specifications: Item Length 2.5 inches (64 mm)Item Width 1.75 inches (44 mm) Item Height 1.75 inches (44 mm) Item Package Depth 2 inches (5 cm). Item Package Width 2 inches (5 cm) Item Package Height 3.5 inches (9 cm) Item Packaged Weight 5.25 ounces (149 grams). Item Package Type Box. Country of origin China. Ben Wa Balls are featured in Pipedream Products Catalog 2008 A New Dimension in Pleasure page 194.