Breast shields play a key role in pumping comfort and efficiency. That’s why Medela incorporated the new Flex™ technology that’s shaped around you with the PersonalFit Flex™ Breast Shields. Its unique oval shape can be rotated 360° allowing you to adjust the breast shield to find the most comfortable pumping position for you. It’s available in 4 different sizes; choose the right size for maximum comfort and pumping efficiency. The rim of the breast shield is made with a soft natural-feeling material that lays smoothly on the breast for comfort. Features & Benefits: What Included 2 - PersonalFit™ Flex Breast Shield Connectors sold separately Specifications: Dimensions Unit Weight: 0.17 lbs Case Weight: 1.50 lbs Unit Size/Packaging: 5.50" x 3.94" x 3.54" Case Size/Packaging: 11.25" x 8.38" x 4.13" Warranty For hygienic reasons they cannot be returned to store once opened.