medela personalfit flex breast shields, 2 pack of large 27mm breast pump flanges, made without bpa, shaped around you for comfortable and efficient pumping medela breast shields play a key role in pumping comfort and efficiency. that’s why medela incorporated the new flextm technology that’s shaped around you with the personalfit flextm 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 - personalfittm 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.