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 changes. At a glance: 105 Degree Celecius angle improves fit for better milk flow The oval shape can be rotated 360ƒ‚‚° Soft, smooth, flexible rim Four tunnel sizes available: 21mm, 24mm, 27mm, 30mm our "Breast shield fitting flyer" guide will help you find the right one for you Made from BPA-free materials.