Replacement breast shields compatible with the Elvie Pump. The unique design and adjustment system provide increased comfort, proper nipple alignment, and efficient pumping. The breast shields are BPA-free for your safety and dishwasher-safe for easy cleaning. The Elvie breast shields are available in sizes 21 mm, 24 mm, and 28 mm. Contents: 2 breast shields. Compatibility: For use exclusively with the Elvie Pump.