With the PersonalFit Flex breast shield you can easily adapt the way your breast shield fits to help you find the most comfortable, most efficient position to pump, even as your breast shape changesAt a glance: 105 Degree Celecius angle improves fit for better milk flowThe oval shape can be rotated 360‚Soft, smooth, flexible rimFour tunnel sizes available: 21mm, 24mm, 27mm, 30mm . our Breast shield fitting flyer guide will help you find the right one for youMade from BPA-free materials