The Duplicity Duo Balls feature 2 large beads of the same size (approximately 4 cm in diametre). Inside each bead is a rolling ball which creates a pleasurable rattling/rolling sensation with the slightest movement.
Even though this toy isn't powered, the motion created with the movement provides a steady stimulation and promotes activity.
The Duo Balls feature a body-safe silicone shell and have a safety loop to pull it out when finished.