Product Overview: The Medela PersonalFit Flex Breast Shield enhances pumping efficiency with its ergonomic and flexible design. Key Features: ‣ Soft, flexible rim for maximum comfort. ‣ Rotatable oval shape adapts to different breast shapes. ‣ Helps optimize milk flow and reduce nipple discomfort. Specifications: ‣ Material: BPA-free plastic. ‣ Size: 27mm.