Inner diameter: 1.5cm（0.6in.）
It is the item we developed from the view point that is different in expressing the stimulation from pressure like Masturbator, and an internal structure. It is designed so that a soft big bump will rub the sensitive part of penis, and if continuous rotational movement of A10 starts, an eternal pleasant sensation will be obtained. As special features of stimulation, not only the stimulation that a bump induces but the pressure stimulation to the whole penis by the rotational movement will be also added. There is pleasantness which the whole penis is jolted and is rubbed. A sense of togetherness near stimulation of fellatio is produced.