This instrument is the most effective and direct breast building instrument, which develops under the basis principle of physiology and physical sucking theory. And its slight but concentrated effect could exercise the muscular tissue mostly (breast muscle develops----next to neural tissue----finally reach hypophysis) and stimulate hypophysis to excrete hormone, thus to exercise muscular tissue stretchy as well as fibre function, also enlarging breast naturally and effectively. It suits Eastern feminine physiology and proved by years of clinical confirmation that it does no harm to human body but does effect for breast beauty.