While maintaining the same characteristics as its standard model, the Rolling Head Cup is made of harder materials for those seeking a stronger sensation. The new materials allow for a firmer, tighter grip and increased stimuli. Enjoy this new stronger, tighter experience. Air hole to control the vacuum suction. Rolling power ball gives an agressive stimulus to the head. Complex stimulus with protuberances. The flexible body allows 360 degree stimulation. Lubricant ring holds and applies lubrication. The smooth pad insertion pad insertion mechanism at the top provides for easy use. Tenga Rolling Head Disposable Male Masturbation Device from Tenga.