They are 2 vibrating Chinese balls that stimulate the erogenous zones of the vagina and give pleasure.
As the vagina is stimulated, it is naturally lubricated with its secretions, dilates and is prepared for a more pleasurable sexual relationship.
With the balls inside, thanks to the vibrating movement, it will create a totally exciting massage deep inside.
Uses 2 AA batteries not included, which can be found in the Batteries section.