The patented compression technology of the Dr. Brown's Manual Breast Pump is designed to help minimize tugging and pinching. The flexible breastcup gently puffs in and out to emulate baby's mouth, tongue and jaw action, designed to create a comfortable pumping experience for mom. BPA Free and dishwasher safe. Patented design conforms to and moves with mom's breast. Designed to minimize tugging and pinching. Gently elicits milk rather than high-suction extraction of milk. Flexible breastcups puff in and out gently to elicit milk. BPA Free; Dishwasher safe.