The Phillip Avent Breast Pump comes with soft and flexible ComfortFit flanges to ensure a comfortable secure seal when pumping. It includes two sizes for a perfect fit. The easy express handle reduces hand fatigue and adjusts to easily switch between stimulation and expression phases. The Let-down phase helps stimulate milk flow and the Expression phase maximizes milk flow to efficiently express breastmilk. This plastic pump is compatible with other Philips Avent feeding products.