geisha balls

Definition

Another name, but less common, for Ben Wa Balls, a matched set of mercury-filled, hollow balls 3/4 to 1 inch in diameter originally made of ivory, now available in plastic, gold, silver, or stainless steel, to be inserted into the vagina where they roll around, especially when walking, and spread vibrations throughout the vaginal area. A variation on this consists in one of the two balls being solid.
Synonyms: Ben Wa Balls; Burmese balls; Thai beads; Rino Tama; vaginal balls.