It is the series 4th to strengthen the power stimulating the top of penis.
Another [ hands free] stress relief accessory for men from a Japan toy maker, a Twin Micro Rotor that will give you wild sensations.
Fit the adapter on the head of your penis, place the two rotors in their slots and start playing with the vibration strenght, speed and patterns. Of course you can also vary pleasure by just using one rotor on the lock, and the other to massage any other part you like. A super nice new adult toy for men!