This set of 2 brazilian balls with vibration effect causes an incomparable sensation of vibration that you will not be able to resist. You just have to moisten your hand with water and hug the Brazilian ball. With the heat of the hand and the humidity, the ball will dissolve in 3 to 5 minutes, releasing a liquid that lubricates and contributes to the preliminaries or as a surprise factor in your relationships. The outer layer of the ball is water and the inner liquid is oil.